teaching addition stories

Visual aids are very important. They help students see the concept clearly. For example, using number lines or pictures of objects to be added. Another element is repetition. Keep repeating different addition stories so that students get used to the concept.

They can be used to make learning fun. For example, by telling a story about collecting marbles. If a child has 3 marbles and finds 4 more, they can easily understand 3+4 = 7 through the story.

There were some problems with the traditional teaching method in addition table teaching. For example, if the teacher directly showed the sorted addition table and asked the students to find the rules and fill in the missing formulas, the process would be boring and the students would be easily distracted. An improved teaching method was to first ask the students which addition formulas within 20 had been learned, and then let the students think about how to classify the formulas, such as sorting them according to numbers or sorting them according to the type of addition. Then, according to the classification method proposed by the students (such as dividing 9 plus a few into one class, etc.), the teacher made the calculations into cards in advance, stuck magnetic nails on the back and gave them to the students, and asked the students to stick the cards on the blackboard for sorting. In this process, the students could discover the rules of the addition table arrangement on their own and cultivate the ability to explore and discover on their own. Moreover, the students were interested and focused. When looking for the law of slanting, by changing the way of asking questions, such as "find the formula that gets 11", the students could find the law of slanting arrangement in the process of finding the formula, and finally fill in the missing formula in the addition table. In addition, in the teaching of the addition formula within 20, the traditional memorization method started from the first column and read in the conventional way. There were problems that were difficult to memorize, remember, and apply. The new reading method started from the big numbers, such as 9 + 2 = 11, which was read as nine and twenty-one, and some of the pithy formulas were integrated with the multiplication formula. The teaching could be divided into two steps. First, the students would read vertically and use it, and then read horizontally (from right to left). Students who had the ability to learn could learn this reading method, and this reading method would also be helpful for learning to abdicate and subtract within 20 in the next semester. At the same time, in the teaching process, attention should also be paid to the classroom organization, to pay attention to students 'independent learning and the opening of the classroom, to pay attention to students' learning, to avoid simple knowledge instilling, to ensure that the teaching focus is highlighted, such as the addition and substitution table rules in the review class within 20 (the numbers behind the minus sign are the same when looking vertically, the numbers in front of the minus sign are the same when looking horizontally, and the numbers are the same when looking diagonally). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were some shortcomings in the teaching of addition and substitution: 1. ** Review Lead-in Stage **: The number of mental arithmetic questions may be small, and some students may not be able to participate fully, resulting in distraction. For some key knowledge, such as finding the least common multiple, if they did not review it enough before class, it might affect the speed of subsequent calculations. 2. ** Student Exploration Stage **: Not enough attention is paid to students with learning difficulties. They often put their energy on students who are good at expressing themselves or whose grades are above average, thus ignoring the learning needs of individual students with learning difficulties. 3. [In-class training segment: The effect is not good when students are used.] Although the average students could solve the questions, the form was not standardized. The students with learning difficulties had difficulty solving the questions, while the top students had nothing to do, resulting in a waste of classroom time and unable to meet the learning needs of students at different levels. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The reflection on the teaching of addition and substitution could be written from the following aspects: ** I. Achievement of teaching objectives ** 1. ** Knowledge and Skills ** - Whether the student can accurately understand the concepts of the commutative law of addition, the association law, or the addition and substitution of scores. For example, in addition, whether the student understood the position and invariable of the addend (the commutative law of addition), and whether the student had mastered the calculation skills such as general fraction in fraction addition and substitution. They could review the class questions, homework, and test results to see how well the students had mastered the rules of addition and multiplication. - Can the student apply the knowledge of addition and substitution to practical calculation problems, including simple addition and deduction of numbers, decimals, or scores, as well as some comprehensive mathematical problems? 2. ** In terms of process and method ** - Observe the development of the students 'thinking process in the process of learning addition and deduction. For example, when exploring the law of addition, whether the students could obtain the law through observation, comparison, induction, etc.; in the teaching of fraction addition and substitution, whether the students could use transformation ideas (such as transforming different decimal points into the same decimal points) to solve the problem. - To evaluate whether the teaching methods used in the teaching process will help the students master addition and multiplication. For example, whether group cooperative learning promoted the communication between students and their understanding of knowledge, and whether multi-media teaching resources helped students better understand abstract computing concepts. 3. ** Emotions, attitudes, and values ** - To assess the students 'interest and participation in the process of learning addition and multiplication. For example, whether the introduction of interesting mathematical situations stimulated the students 'curiosity about addition and substitution, whether the classroom interaction was positive, and so on. - Pay attention to the students 'attitudes when faced with difficulties in addition and multiplication, whether they actively try to solve the problem or give up easily, and the emotional experience such as the sense of accomplishment after solving the calculation problem. ** 2. Teaching content ** 1. ** Selection and organization of content ** - Check if the difficulty level of the teaching content is suitable for the student's learning level. If the teaching content was too simple, the students would feel that it was not challenging enough, and if it was too complicated, it might cause the students to feel frustrated. For example, in the teaching of addition and substitution of different decimators, whether the teaching content of general fraction was reasonably explained and expanded according to the students 'existing knowledge base. - Is the teaching content organized? For example, the students would be taught from simple to complex (such as adding and deducting whole numbers first, then decimals, and adding and deducting fraction), and whether the transition between the various knowledge points was natural or not, and whether it would help the students build a complete knowledge system of addition and substitution. 2. ** Depth and breadth of content ** - He thought about whether he had dug deep into the key content (such as law calculation, arithmetic, etc.) in the addition and substitution operation teaching. For example, in the teaching of the law of additivity, whether to let the students fully understand why the first two numbers were added first or the last two numbers were added first when adding three numbers, and the intrinsic reason why the sum did not change. - At the same time, he also had to consider the breadth of the teaching content and whether it expanded the connection between addition and deduction and real life or other subjects. For example, through the price calculation in the shopping scene to reflect the widespread application of addition and substitution in life, or the addition and substitution operations involved in scientific experiment data processing. ** 3. Teaching methods and strategies ** 1. ** The effectiveness of teaching methods ** - This paper analyzed the effects of teaching methods such as lecture method, demonstration method, and inquiry method in addition and substitution teaching. For example, when explaining the vertical calculation of integral addition, whether the teaching method clearly conveyed the calculation steps and carry rules; in the addition and substitution of scores, whether the demonstration method (such as using graphs to represent scores) helped students understand the calculation theory. - Does the inquiry method give students enough space to learn independently? For example, when exploring the law of addition, should the students be guided to discover the law on their own instead of directly telling the result? 2. ** The rationality of teaching strategies ** - Whether or not a variety of teaching strategies are used to meet the needs of students with different learning styles. For example, for visual students, whether they used teaching resources such as graphs and charts, and for kinaesthetic students, whether they arranged some practical activities (such as using a stick to perform addition and multiplication). - Consider the role of teaching strategies in classroom management. For example, whether the grouping strategy of group cooperative learning was reasonable, whether it could avoid the phenomenon of individual students "free riding", and at the same time promote cooperative learning between students. ** 4. Student performance and individual differences ** 1. ** Overall student performance ** - It summarized the overall performance of the students in the addition and substitution class, including class participation, homework completion, test results, and so on. For example, whether most students answered questions actively in class, how accurate their homework was, and the distribution of scores in the addition and substitution section of the exam. 2. ** Coping with Individual Disparities ** - To analyze how to treat the individual differences of students in the teaching process. For students with strong learning ability, whether they were provided with expansive learning tasks, such as guiding them to explore more applications of the law of operation in simple calculations after mastering the basic addition and deduction operations; for students with learning difficulties, whether they were given enough attention and guidance, such as whether they were given individual guidance and intensive exercises for students who were easy to make mistakes in the calculation of decimals. ** 5. Problems in the teaching process and improvement measures ** 1. ** Problems ** - Find out the specific problems in the teaching process. For example, the teaching schedule was unreasonable, resulting in some important content being explained in a hurry; or the teaching resources were not fully utilized, such as the animation demonstration in the multi-media class did not play a very good role in assisting teaching. - The reason for the problem could be that the teaching design was not perfect enough, the students 'learning situation was not estimated enough, or the teacher's own teaching ability needed to be improved. 2. ** Modification measures ** - According to the existing problems, specific improvement measures were proposed. If it was a problem of teaching time arrangement, he could re-plan the teaching process and reasonably allocate the time of each teaching link. If it was a problem of the use of teaching resources, he could re-select or produce more effective teaching resources, such as making more intuitive teaching animations of score addition and deduction. - He thought about how to prevent similar problems from happening again in future teaching, such as strengthening the rehearsal and evaluation of teaching design to continuously improve his teaching ability. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following are a few aspects that may be involved in the reflection of addition and substitution teaching: ** 1. Teaching methods ** 1. ** Diverse algorithms and independent exploration ** - It was important to give the initiative to the students when teaching addition and substitution of numbers within ten thousand, so that they could explore the calculation method independently with the help of their existing knowledge and experience. For example, for mental arithmetic and vertical calculation, don't design overly guiding questions to avoid bringing students into the default method. Let the students do the math by themselves and share the results in the group so that they can experience the success of independent learning. - In the teaching of vertical calculation, students were also allowed to try it out on their own, and then they could exchange and demonstrate. This method could effectively expand the students 'thinking and promote the exchange of algorithms. 2. ** Situation Creation and Question Guidance ** - Creating a suitable situation was very helpful to teaching. For example, the introduction of addition teaching from the pictures of the World Exposition could arouse the enthusiasm of students to learn. At the same time, it allowed students to find mathematical information in the situation and experience the connection between addition and life. - In the process of teaching, the social practice situations such as the different ticket prices of different means of transportation were used to let students experience the significance of deduction in comparison and feel the connection between deduction and life. Moreover, it allowed students to discover, raise, and solve problems independently in specific situations, experience independent thinking, take the initiative to explore, report and communicate, and so on. Finally, the teacher would focus on introducing a main method that would help students form a representation and experience mathematical ideas. - However, there might be problems in the creation of situations, such as the data processing in some situations that might make students confused. For example, in a teaching situation where 500 bottles were given once, 520 bottles were given in the first two weeks, and the remaining 20 bottles were ignored in the teaching. This may cause students to have doubts and need to better deal with the data logic in this situation. 3. ** Estimated Teaching ** - The cultivation of estimation ability was part of the teaching. However, there were some puzzles in the teaching. For example, the format of the estimation formula was not clear. It was not known whether the students should directly write the approximate calculation result (such as 190 + 220 = 410) or use the half-text and half-algorithm format (such as 192+219 is approximately equal to 190+220 = 410). - Students had a biased understanding of estimation, and there was a situation where they estimated for the sake of estimation. Some students would first calculate the accurate answer and then find an approximate number as an estimate, and most students would not use the estimation method to test the rationality of the calculation results. ** 2. Student learning ** 1. ** Cultivation of computing ability ** - In the cultivation of computing ability, one must pay attention to correct, flexible, reasonable, and concise operations. For example, in the process of solving problems, students should be allowed to choose the calculation method flexibly according to the actual situation. For example, in the situation where estimation and precise calculation were needed, students should improve their computing ability. - In teaching, open questions were designed to allow students to solve the problem in different ways (multiple solutions for one question). In the observation and comparison of different methods, they chose a reasonable and concise calculation path. - However, there might be insufficient practice in actual teaching, resulting in students not being able to consolidate their knowledge well and affecting the improvement of their computing ability. 2. ** Attention to Individual Students ** - In the teaching process, the individual differences of the students should be fully taken into account, including their acceptance ability and psychological characteristics. For example, in the teaching of multiplication (such as 300 - 116) where there are zeros in the middle of the minuend, it may be because the students do not have a good grasp of the learning situation, and the situation of individual students listening to the class and mastering the knowledge is not ideal. When students explore the calculation process (such as demonstration 300 - 116), the teacher should give enough time for the students to think. They should not be in a hurry to explain. They should face all the students and let the students inspire each other to find a solution to the problem. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is a reflection on the addition and deduction of the second root: ** 1. Students 'Knowledge Mastery ** 1. ** Simple Problem ** - Students had difficulty in decomposing the radical. For example, a number like 32 could not be decomposed into 16 by 2 at once, but into 4 by 8. It could not be decomposed completely. He also couldn't completely understand the decomposition of the numbers 108 and 98. This reflected that the students were not familiar with the decomposition of numbers, which was crucial for the reduction of the second root. - When the square root was a fraction, the student's grasp was even worse. For example, when the numerator of the root was 8 or 27, many students directly multiplied it by 8 or 27, resulting in a large amount of calculation and easy to make mistakes. In fact, multiplying by 2 or 3 could simplify it. This meant that the students did not understand the simplest method of rational multiplication of the square root. 2. ** Combining the same kind of square root problems ** - When combining the same kind of square root, the students made more mistakes when combining the coefficient, especially when the coefficient was a score. This reflected the students 'lack of knowledge in the calculation of scores and similar terms. The teacher needed to explain more and explain in detail when explaining the step of combining the same kind of square roots. ** 2. Teaching strategy ** 1. ** Practice and Test ** - From the perspective of teaching effectiveness, it required more teaching, more practice, and more testing. Currently, only one-third of the students were correct after the test. Under normal circumstances, two-thirds of the students should be correct. If time allowed, they could create a second root topic exam with about 20 questions. They would conduct a second exam for the questions that made a lot of mistakes. They would make up for the mistakes made by the students after the second exam to promote the students 'proficiency in the algorithm. 2. ** Teaching methods ** - In the teaching process, we should pay attention to the application of analogy, such as analogy of similar terms, combination of similar terms, and integral addition and deduction to guide students to understand the definition of similar square roots and the rules of square root addition and deduction. This will allow students to naturally migrate to new knowledge on the basis of existing knowledge, establish the connection between old and new knowledge, and form a mathematical knowledge system. At the same time, by creating a living situation or designing a series of questions as a teaching situation, it can stimulate students 'interest in learning and thirst for knowledge, and improve the effectiveness of classroom teaching. 3. ** Pay attention to the individual aspects of students ** - In the classroom, they should always pay attention to the students 'psychology and students with learning difficulties, and give students appropriate encouragement, enlightenment, and evaluation. For example, when a student made a mistake, such as writing on the blackboard, they had to find other students to provide help in time and guide the students to reflect on the reasons for the mistake. In group studies, students should be encouraged to cooperate and explore independently, so that students can exchange their own opinions and put forward their own opinions for everyone to comment. Teachers should go deep into the group to collect information, guide learning, and give full play to the students 'main role. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

#<Self-made teaching plan for big class of addition and substitution application questions> ##1. Teaching objectives 1. Let the children learn how to write their own addition and substitution problems. 2. Cultivate children's thinking flexibility, agility, logic and oral expression. 3. To develop the child's visual ability and judgment. ##2. Teaching preparation 1. Arithmetic cards, a slide, a number of flowers (or other small items), a drum, a picture (containing a different number of animals or objects), and a set of numbered cards for each person. 2. Ask the parents to take the children to buy things in advance so that the children understand the process of buying and selling. Prepare 10 Math Books for Children, 10 calculation cards, and 10 fruit cards. ##3. Teaching process ###(1) Introduction of revision 1. Through games (such as Sunshine Express), review addition and multiplication within 10. For example, if the teacher said that the calculation was "2 + 3 =", the child would answer "5". 2. Show a slide, the content is some addition scenes, such as children playing on the playground, monkey activities on the grass, the number of trucks in the parking lot, etc., let the children answer the calculation and the number according to the picture. You can use the method of answering first, group competition, or collective answer. ###(2) Adding applied problems 1. ** Create a scenario and write a question ** - Ask the two children to come to the front. The teacher will give two flowers to one child and three flowers to the other child. Then ask,"What is the teacher doing?" Following that, he used the two numbers "2" and "3" to demonstrate an addition problem."The teacher gave the children red flowers. First, he gave the children two red flowers. Then, he gave the children three red flowers. How many red flowers did the teacher give in total?" Guide the child to list the calculations. 2. ** Explain how to write questions ** - By repeatedly asking,"What's the thing in this question? What were the two known numbers? What was the last question?" Explain to the children the basic methods and steps of making addition application problems. ###(3) Subtraction word problems teaching (can be compared to addition word problems teaching steps) 1. ** Create a scenario and write a question ** - For example, if the teacher showed five apples and took away two, he would ask the child,"There were originally five apples. Now that two are taken away, how many apples are left?" Guide the child to write the formula "5 - 2 = 3". 2. ** Explain how to write questions ** - Similarly, by asking,"What does this question talk about? Which two numbers do you know? What's the problem?" To let the children understand the composition of the multiplication word problem. ###(4) Consolidating Practice 1. ** Training with supplementary questions ** - For example, if there were originally three planes in the sky and four more planes flew over, the teacher would first make up the questions, then inspire the children to think whether it was complete, and guide the children to ask the question,"How many planes are there in the sky?" He also asked the child to explain the problem completely and write down the formula. 2. ** Practice of drawing pictures and writing questions ** - Show the picture (if there are ducks in the picture, the size, color and position are different). Ask the child to write an addition or deduction problem according to the picture, and use the card to arrange the calculation. 3. ** You make it up, I make it up ** - Two people in a group, one person wrote the questions, and the other set the calculations. ###(5) Organizing the game-pass the ball and make up application questions The child listened to the drumbeat and passed the ball. When the drumbeat stopped, the child who got the ball ran to the front and used what he usually saw, heard, or did to make up an addition or deduction application question for everyone to listen to. If he made it right, the teacher would reward him with a small red flower. The game was repeated. ###(6) Evaluation Teacher: Today, we learned how to write addition and substitution problems. There are three conditions for writing a problem. First, you have to say one thing. Second, you have to have two numbers. Third, you have to have a problem. Please use your brains to come up with more and better problems when you go back. ##IV. Reflection on Teaching 1. ** Children's learning situation ** - In the whole teaching activity,"application questions" were difficult for the children to understand and master. Some of the children performed well in the creation and solution of the addition problem, and they could understand the concept of adding two parts to get a total number. However, in the deduction problem, some children had difficulty understanding the known total number and one part to find the other part. For example, in a deduction problem involving a specific scene, such as taking a part of a group of items to find the remaining part, the child may confuse the relationship between quantity and quantity. 2. ** The effectiveness of teaching methods ** - Scenarios and games could better attract children's attention and increase their participation. For example, by giving flowers to children and showing the change in the number of apples, children could intuitively feel the relationship between numbers, which would help them understand the structure of the application questions. In the game segment, the method of passing the ball to make up the application questions stimulated the children's sense of competition and prompted them to think and create actively. However, children with weaker comprehension abilities may need more one-on-one guidance. 3. ** Combination of life experience and teaching ** - It was helpful for children to experience the process of buying things in advance. Many children could apply the buying and selling relationship in shopping to the creation of application questions, such as "I have 5 yuan, but I bought a 3 yuan toy. How much money do I have left?" This shows that connecting mathematics education with real life can enhance children's understanding and application of mathematical concepts. However, he could still further explore other scenes in life, so that children could have more material to create. 4. ** Modification measures ** - In future teaching, more different types of practice methods could be added, such as group competition, mutual error correction, etc., to strengthen children's understanding of applied problems. For children who had difficulty understanding, they could design some simple exercises and guide them step by step from the most basic number relationship. At the same time, continue to strengthen the connection between mathematics education and life, encourage children to observe mathematical phenomena in life, and improve their ability to use mathematical knowledge to solve practical problems. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is a teaching plan for the mixed addition and deduction of rational numbers and an example of reflection: ** 1. Teaching objectives ** 1. Let the students master the rules of addition and deduction of rational numbers. 2. Cultivate the students 'ability to calculate accurately and simplify the calculation using the calculation law. 3. To improve the students 'ability to solve the practical problems of addition and deduction of rational numbers. ** 2. Important and Difficult Points in Teaching ** 1. ** Main point ** - Master the order and rules of addition and deduction of rational numbers. - Learn to use the commutative law of addition and the association law to simplify operations. 2. ** Difficulty ** - Accurately handle the symbols in the calculation. - He could flexibly use the operation law to perform simple calculations. ** 3. Teaching process ** #(I) Knowledge Review 1. Review the addition rule of rational numbers: - Add two numbers with the same sign, take the same sign, and add the absolute value. - When two numbers with different signs are added together, the sum is 0 when the absolute values are equal; when the absolute values are not equal, the sign of the number with the larger absolute value is taken, and the smaller absolute value is deducted from the larger absolute value. - If a number was added to 0, it would still be this number. 2. Review the rational number substitution rule: Subtracting a number is equal to adding the opposite number. #(II) New lesson teaching 1. Introduction of rational numbers, addition and substitution, mixed operations - Give a few formulas for addition and substitution of rational numbers, such as <3+(-2)-5>,<-1 - (-3)+2>, etc., to guide the students to think about how to calculate according to the order. - The order of calculation was emphasized: from left to right. 2. Using operational laws to simplify operations - Explain the application of the commutative law of addition, a + b=b + a, and the association law, a + b +c=a+ b + c, in the mixed operation of addition and substitution of rational numbers. - For example, for the formula "2 - 3+5 - 7", you can combine positive numbers with positive numbers and negative numbers with negative numbers, which is "(2 + 5)+(-3 - 7)", and then calculate them separately. #(3) Class Practice 1. Arrange some exercises on rational addition and deduction, such as: - \(4 - 7+3 - 5\) - \(-2+5 - 8+3\) - <3.5 - 2.5+1.5 - 4.5>(Including the operation of decimals to let students understand the concept of rational numbers including decimals and fraction) 2. Inspecting the students 'practice and correcting the mistakes that the students made during the calculation process, especially the symbols. #(IV) Class summary 1. Recalling the order and rules of addition and substitution of rational numbers. 2. It emphasized the importance and methods of using operational laws to simplify operations. #(5) Homework 1. Arrange an appropriate amount of homework, including some basic rational number addition and deduction mixed operation questions and questions that need to use the operation law to simplify the operation. ** 4. Reflection on Teaching ** 1. the key of success - Through the knowledge review session, it effectively helped the students consolidate the basic rules of addition and deduction of rational numbers, laying a good foundation for the study of mixed operations. - In the course of the new lesson, he explained the application of the operation order and operation law with specific formulas. It was more intuitive and most students could understand and master it. - The classroom practice session could find the students 'problems in time, such as symbol processing errors, and correct them accordingly. 2. deficiencies in - For some students with learning difficulties, it was still difficult to use the operational law to simplify operations. They might need more one-on-one tutoring or more basic exercises. - In the teaching process, there were few examples of the application of rational addition and deduction in real life, which was not conducive for students to understand the practical significance of the operation. This part of the content could be added in the subsequent teaching. - The pace of the class could be further optimized to give students more time to think and discuss on their own to increase student participation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is an example of a two-digit addition: ** 1. Teaching objectives ** 1. Let the students understand and master the method of two-digit addition. 2. Through practice, the students could improve their calculation speed and accuracy. 3. Cultivate students 'mathematical thinking and logical reasoning ability. ** 2. Important and Difficult Points in Teaching ** 1. ** Main point ** - Master the method of decomposing numbers, calculating separately, and then adding them in two-digit addition. - Understand the principle of carry and be able to handle carry situations correctly. 2. ** Difficulty ** - Able to flexibly use fast calculation methods for different types of two-digit addition (such as carry and non-carry). - It allowed students to understand the mathematical principles behind the quick calculation method, not just the mechanical memory. ** 3. Teaching process ** 1. ** import ** - He began with simple one-digit addition exercises, such as 3 + 5, 4+7, etc., and then led to the topic of two-digit addition. Ask the students about their understanding of the conventional calculation method of two-digit addition, and then introduce the quick calculation method. 2. ** New Grant ** - Explain the quick calculation method of two-digit addition: decompose the two addenda into ten digits and one digit respectively. First, calculate the addition of the ten digits, then calculate the addition of the one digit, and finally add the two results, paying attention to the carry. For example, 28+31, 20 + 30 = 50, then 8+1 = 9, and finally 50+9 = 59. - The demonstration was done through multiple examples, such as 75+24, 56 + 29, etc., while emphasizing the calculation steps and the processing of carry. 3. ** Practice * - He gave the students some two-digit addition exercises and asked them to complete them independently in class. The practice questions could include different types of two-digit addition, with or without carry. - The teachers would patrol and find problems in the calculation process in time and give guidance. 4. ** Summing Up ** - Please share your experience and problems in doing the exercises. - The teacher summarized the key points of the two-digit addition method and emphasized the importance of carry again. ** 4. Reflection on Teaching ** 1. ** Strengths ** - ** Increase calculation efficiency **: This quick calculation method helps students to quickly calculate two-digit addition. It increases the calculation speed to a certain extent and is very helpful for the calculation part of mathematics learning. - ** Cultivate mathematical thinking **: By decomposing numbers and calculating separately, students can think about addition operations from different angles, cultivating their mathematical thinking ability and logical reasoning ability. - ** Intuitional and easy to understand **: The method is relatively intuitive and easy for students to understand. Especially through the demonstration of multiple examples, students can quickly grasp the calculation steps. 2. ** Flaws ** - ** Limited scope of application **: This quick calculation method is mainly suitable for two-digit addition. For multi-digit addition or decimal-digit addition, it needs to be further expanded or cannot be directly applied. - ** Confusion possible **: Some students with weaker comprehension ability may be confused in decomposing numbers, calculating separately, and carrying, resulting in calculation errors. - ** Lacking deep understanding **: Some students may just mechanically follow the steps and do not really understand why they need to calculate in this way. Their understanding of mathematical principles is not deep enough. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>