Elementary school fifth grade first volume mathematics practical application question
Based on context alone
The following are some practical math problems that may be involved in the first volume of the fifth grade:
** 1. Math Questions related to Decimals Multiplication **
1. ** Shopping Questions **
- Xiao Ming bought five of them for 0.8 yuan per pencil. How much did it cost in total?
- Answer: According to the meaning of the multiplication of decimals, find the sum of several addenda using multiplication. Here is to find the number of five 0.8, the formula is [0.8×5 = 4](Yuan).
2. ** Area calculation problem **
- A rectangular flower bed, 3.5 meters long and 2.4 meters wide. How many square meters is this flower bed?
- Answer: Rectangle area = length x width, so the flower bed area is 3.5 x 2.4 = 8.4 (square meters).
** 2. Math problems related to decimals division **
1. ** Average score problem **
- Mom bought 4.8 kilograms of apples and spent a total of 12 yuan. How much is it per kilogram of apples?
- Answer: Given the total price and quantity, find the unit price. Divide by division, that is,<12> 4.8 = 2.5>(Yuan/kg).
2. ** Multipliers (including decimals)**
- The weight of an elephant was 5.1 tons, and the weight of a gibbon was 0.85 tons. How many times was the weight of an elephant compared to the weight of a gibbon?
- Answer: To find how many times a number is another number, divide it by [5.1 div.0.85 = 6].
** 3. Simple equations related application questions **
1. ** Age problem **
- Dad's age is three times that of Xiaoming's by two years. Dad is 35 years old this year. How old is Xiaoming this year?
- Answer: Assuming that Xiao Ming is this year's age, according to the meaning of the question, you can write the equation '3x + 2 = 35'.
- First, subtract 2 from both sides of the equation to get <3x = 33>, then divide both sides by 3 to get
Elementary school fifth grade first volume mathematics final paper
The following is an example of a fifth-grade mathematics final paper: ** Title: "Fifth-grade mathematics study summary and reflection"** ** I. Introduction ** The first volume of mathematics in the fifth grade was an important stage in the primary school mathematics learning process. It covered many key knowledge points and had further requirements for students 'mathematical thinking. ** 2. Analysis of Main Knowledge Points ** 1. ** Decimal Multiplication and Division ** - Decimal multiplication was an extension based on the multiplication of numbers. When calculating the multiplication of decimals, we multiply them as decimals, and then determine the number of decimals according to the number of decimals in the factor. For example, when calculating 2.4×0.8, the first calculation was based on 24×8 = 192. Because 2.4 was a decimal place and 0.8 was also a decimal place, there were two decimals in total. Therefore, the result was 1.92. - Decimal division also had its own unique calculation method. In a division where the divisor was a fraction, the divisor needed to be converted to an integral number first, and the dividends needed to be expanded by the same multiple. This process required the students to accurately grasp the movement of the decimal point. For example, when calculating 3.6 div.9, the quotient 0.9 should be expanded by 10 times to 9, and the dividends 3.6 should also be expanded by 10 times to 36. Then, the result should be calculated according to the integral division 36 div.9 = 4. - When solving the practical problems of decimals multiplication and division, we need to carefully analyze the quantitative relationships in the questions. For example, given that the product of two numbers is 36.4, if one factor is multiplied by 9 and the other factor is divided by 3, we can solve it according to the law of the product. If one factor was expanded by 9 times and the other factor was reduced by 3 times, then the product would be expanded by 9/3 = 3 times, so the product after the change was 36.4×3 = 109.2. 2. ** Simple equation ** - An equation was an equation that contained unknown numbers. When learning simple equations, one must first understand the definition of an equation and be able to accurately determine whether an equation was an equation. For example, x+3 = 5 is an equation, but 3 + 5 is not an equation. - The solution of the equation was an important part of the simple equation. In the process of solving the equation, we relied on the nature of the equation. For example, in the equation 2x - 5=7, first add 5 to both sides of the equation to get 2x = 12, then divide both sides of the equation by 2 to solve x = 6. - Creating equations to solve practical problems was a comprehensive application of simple equations. For example, when solving the problem of "Little Light is 3 years old this year and Dad is 26 years old. In a few years, Dad's age will be three times that of Little Light", we can assume that Dad's age will be three times that of Little Light in x years. According to the principle that the age difference does not change, the equation (3 + x)×3=26 + x can be written, and then the value of x can be obtained by solving the equation. 3. ** Polygon Area ** - As for the study of the area of a triangle, we learned the area calculation formulas of common pyramids such as a triangle, a quadrilateral, and a echelon. The area formula of a quadrilateral was S = ah (a is the base, h is the height), the area formula of a triangle was S=1/2ah, and the area formula of a echelon was S=(a + b)h/2 (a and b are the upper and lower bases, respectively, and h is the height). - When solving the practical problem of the area of a hexagon, especially the area calculation of a composite graph, we need to use these formulas flexibly. For example, for a combination of a triangle and a rectangular shape, we need to calculate the area of the triangle and the rectangular shape separately, and then add them together to get the area of the combination. ** 3. Difficulties in learning and solutions ** 1. ** Decimal Point Processing in Decimal Multiplication and Division ** - In the multiplication and division of decimals, the handling of the decimals was an error-prone area. Many students would forget to count the decimals of the factor, the dividends, and the divisions, resulting in errors in the results. The way to solve this problem was to carefully mark the position of the decimal point during the calculation process and check it after the calculation was completed. 2. ** Formula and solution ** - Many students couldn't accurately find the equivalent relationship in the question when solving practical problems, so they listed the wrong equations. To solve this problem, he needed to read more questions and carefully analyze the quantitative relationships in the questions. He could use drawing and other methods to help understand. When solving equations, some students were prone to making symbolic errors in operations such as shifting terms. They needed to strengthen their understanding and practice of the nature of the equation. ** IV. conclusion ** The first volume of mathematics in the fifth grade was rich and varied. The various knowledge points were interconnected and different from each other. Through the study of decimals multiplication and division, simple equations, and the area of a hexagon, we not only improved our computational ability, but also enhanced our mathematical thinking ability and the ability to solve practical problems. In the process of learning, although we will encounter some difficulties, through targeted practice and continuous summary of experience, we can better grasp this knowledge and lay a solid foundation for future mathematics learning. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Elementary school first grade mathematics application questions
The following are some questions that are suitable for first-grade math problems: ** 1. Comparisons ** 1. Little Ming had 7 candies, Little Red had 5 candies, how many more candies did Little Ming have than Little Red? 2. There were eight monkeys and three elephants in the zoo. How many more monkeys were there than elephants? ** 2. Sum-up Questions ** 1. There were three birds on the tree, and two more flew over. How many birds were there in the tree? 2. Mom bought four apples, and Dad bought three apples. How many apples are there in the house? ** 3. Remaining Questions ** 1. There were 10 dumplings on the plate. After eating 3, how many dumplings were left? 2. Xiao Yang had nine pens and had used four. How many were left? ** 4. Position Order (queuing problem)** 1. The students lined up to do morning exercises. There were four people in front of Xiao Ming and three people behind him. How many people were there in this team? 2. Counting from front to back, Little Blossom was ranked fifth. Counting from back to front, Little Blossom was ranked third. How many people were there in this row? ** 5. Simple increase and decrease questions ** 1. There were originally five fish in the fish tank, and now there were two more. How many fish were there now? 2. There were seven balloons in the box. One of them flew away, so how many were left? <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Elementary school mathematics fifth grade test paper
The following is an example of a fifth-year math test paper: ** I. Fill-in-the-blanks (28 points)** 1. \(8.05dm³ = (8)L(50)ml\);\(27800cm³=(27.8)dm³=(0.0278)m³\)。 2. <1 - 20>>(1, 3, 5, 7, 9, 11, 13, 15, 17, 19), even numbers have "(2, 4, 6, 8, 10, 12, 14, 16, 18, 20), the prime numbers are (2, 3, 5, 7, 11, 13, 17, 19), composite numbers have <4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20>, composite numbers have <9, 15>, composite numbers have <4, 6, 8, 10, 12, 14, 16, 18, 20>, composite numbers have <1>, which is neither prime nor composite. 3. The volume of a bottle of green tea was about 500(ml). 4. "493" is a multiple of "3" if it increases by at least "2", and "5" if it decreases by "3". 5. The three-digit number "2A2" was a multiple of "3"."A" could be "((2),(5),(8)". 6. Make a cube cabinet with 24dm of iron wire. The length of the cube is 24 div12 = 2dm, its surface area is 2x2x6 = 24dm2, and its volume is 2x2x2 = 8dm3. 7. Write out two coprime numbers, both prime numbers ((2 and 3)), both composite numbers ((8 and 9)), one prime number and one composite number ((3 and 4)). 8. The sum of two consecutive even numbers is <162>. If the smaller even number is <x>, then <x + (x + 2)=162>,<2x+2 = 162>,<2x = 160>, and <x = 80>. These two numbers are <80> and <82> respectively. Their greatest common factor is 2, and their least common multiple is 3280. 9. Write the largest three-digit number that has a quotient of 2, is a multiple of 3, and can be divided by 5. 10. Using the three numbers, 4, 5, 9, to arrange a three-digit number, making it a multiple of 2, there are 594, 954, a total of 2, and then arranging a three-digit number, making it a multiple of 5, there are 495, 945, a total of 2. 11. If a cube with an edge length of 1 decimeter is cut into small cubes with an edge length of 1 centimeter, 1 decimeter is 10 centimeters. You can cut a total of 10×10×10 = 1000. If you put these small cubes in a row, the length is 1000×1 = 1000 centimeters. ** 2. Choice (12 points)** 1. If a is a prime number, then a has only two factors, 1 and itself, so the correct number is C. 2. A composite number has at least 3 factors. The answer is A. 3. The characteristic of the multiple of <2, 5, 3> is that the unit is <0> and the sum of the numbers is a multiple of <3>, so <30> is a multiple of <2, 5, 3>, and the answer is <C>. 4. If the edge length of a cube is expanded by a factor of 2, its volume will be expanded by a factor of 2×2×2 = 8. The answer is C. 5. (The relevant content of the cube expansion map is not given here, so it is impossible to answer accurately.) 6. Since each team had exactly 13 people, the number of students in the class was a multiple of 13 people, so there might be 65 people in the class. The answer was C. ** 3. Judgment. Draw a tick in () if correct, and a cross in () if wrong (6 points)** 1. If the volume of two cuboids is equal, their surface areas are not necessarily equal, so (×). 2. The largest factor and the smallest multiple of a number are equal, so it is wrong for a factor of a number to be smaller than its multiple,(×). 3. The length of the edge is a cube of 6cm. The volume and surface area are the same, but the units are different and the meaning is different, so (×). 4. In natural numbers, it was either odd or even (tick). 5. The numbers in the single digits were "3, 6, 9", not necessarily all times "3",(×). 6. Since <12> 3 = 4>, it should be said that <12> is a multiple of <3> and <4>, and <3> is a factor of <12>, so (×). ** 4. Give it a try (10 points)** (Unable to give an accurate answer since no details were given) ** 5. Solve the problem (44 points)** 1. The volume of a liquid medicine box is 14L = 14000ml. If the liquid medicine is sprayed out every minute, it will take 14000/700 = 20 minutes to spray out a box of liquid medicine. 2. The school transported 7.6 cubic meters of sand and laid it in a sand pit that was 5 meters long and 3.8 meters wide. The thickness was 7.6 × (5×3.8)=0.4 meters. 3. To paint a cuboid classroom with a length of 8 meters, a width of 6 meters, and a height of 3.5 meters, the area that needs to be painted is 119 square meters. Given that the paint used per square meter is 0.3 kilograms, the classroom needs to use 119 kilograms of paint. 4. A cuboid container was measured from the inside. The length and width were both 2dm. After pouring 5.9L of water into the container, the height of the water was 5.9 div.(2×2)=1.475dm = 14.75cm. Then, a tomato was put into the water. At this time, the depth of the water in the container was 16cm. The volume of this tomato was 5cm. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Elementary school grade 4 mathematics question bank electronic version
The following were some electronic resources for fourth grade primary school mathematics: "Fourth grade primary school mathematics signature question bank", there was also the high-definition electronic version of the fourth grade mathematics easy to make mistakes review (with answers), the 2023 - 2024 academic year fourth grade mathematics final exam blank electronic version, the fourth grade primary school mathematics first volume Su Education edition second unit test paper (with answers) electronic version, etc. These resources included signature questions, error-prone questions, unit test papers, end-of-term test papers, and many other types of questions. They could be used for the study and practice of mathematics in the fourth grade of primary school. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Elementary school fourth grade first volume western normal university edition mathematics question
The following is some of the content related to the fourth grade mathematics questions: ** 1. Unit Conversion ** 1. ** Conversion of length units ** - For example, how many decimeters was 3 meters? According to 1 meter = 10 decimeters, 3 meters = 3×10 = 30 decimeters. - How many meters was 500 centimeters? Since 1 meter was equal to 100 centimeters, 500 centimeters was equal to 500 divided by 100 = 5 meters. 2. ** Area Unit Conversion ** - How many square decimeters was 2 square meters? 1 square meter = 100 square meters, 2 square meters = 2×100 = 200 square meters. - How many square meters is 30000 square centimeters? Since 1 square meter = 10000 square centimeters, 30000 square centimeters = 30000 divided by 10000 = 3 square meters. ** 2. The classification of angles and related calculations ** 1. ** The degree of the angle is determined ** - Give the degree of an angle and determine what angle it is. For example, an angle of 35° was an acute angle because it was greater than 0° and less than 90°. - For an angle of 120°, since it was greater than 90° and smaller than 180°, it was an obtuse angle. 2. * * Calculating the relationship between the number of horns ** - Given a circular angle, how many right angles is it equal to? Because 1 circle angle = 360°, 1 right angle = 90°, so 1 circle angle = 360° × 90° = 4 right angles. ** 3. Relationship between quantity (unit price, quantity, total price; speed, time, distance)** 1. ** Relationship between unit price, quantity and total price ** - Knowing that the unit price is 5 yuan, the quantity is 8 pieces, asking for the total price. According to the unit price x quantity = total price, the total price = 5 x 8 = 40 yuan. - If the total price is 60 yuan and the unit price is 10 yuan, ask for the quantity. From the total price divided by the unit price = the quantity, it can be seen that the quantity = 60 divided by 10 = 6. 2. ** Speed, Time, Distance Relationship ** - Speed: 12 m/s, Time: 5 seconds, Distance: According to the speed x time = distance, the distance = 12 x 5 = 60 meters. - The distance is 80 kilometers, and the speed is 20 kilometers per hour. From the distance/speed = time, it could be seen that time = 80/20 = 4 hours. ** 4. Rectangle and Square Area Classes ** 1. ** Rectangle Area Calculation ** - Given that the length of the rectangular shape is 8 cm and the width is 5 cm, find the area. According to the area of the rectangular shape = length x width, the area = 8 x 5 = 40 square centimeters. - If the area of the rectangular shape is 48 square meters and the width is 6 meters, find the length. From the length = area/width of the rectangular shape, it could be seen that the length = 48/6 = 8 meters. 2. ** Square Area Calculation ** - The side of a square is 7 decimeters. Find the area. According to the square's area = side length x side length, the area = 7 x 7 = 49 square decimeters. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What are the mathematics books suitable for the fifth grade of elementary school?
The following suggestions are suitable for extra-cursory reading of mathematics in grade 5: The Math Garden series was published by Zhejiang Education Press Group. It is suitable for primary school grade 5 students to read, including the knowledge of the whole number, fraction, decimals, percentage, geometry, etc. The content is simple and easy to understand, and the questions are varied. The Math Fairy series was published by the Beijing Education Press. It is suitable for primary school students in grade 5. It is an interesting story-based introduction to basic mathematical knowledge such as scores, decimals, and numbers. 3. The Series of Elementary School Mathematics Problems was published by Shanghai Education Press. It is suitable for primary school students in grade 5 to read, including daily life and mathematical application problems such as shopping, transportation, calculation, etc. It guides mathematical thinking through practical problems. 4. The Math Picture Book series is published by Shandong Education Press Group. It is suitable for primary school grade 5 students to read. It will introduce basic mathematical knowledge in the form of comics, such as numbers, scores, decimals, proportions, etc. It is interesting and easy to understand. The above are some extra-cursory reading materials suitable for primary school fifth grade mathematics. You can choose the books that suit you according to your interests and needs.
Elementary school third grade second volume water depth measurement typical application question answer
The following are the typical application questions and examples of answers for the third grade of primary school: ** 1. Use a thin and straight bamboo pole to measure the depth of the swimming pool ** 1. ** Title * - After inserting one end of the bamboo pole into the water (touching the bottom of the pool), the part that was not wet was 100 centimeters long. Turning the bamboo pole over and inserting it into the water (also touching the bottom of the pool), the part that was not wet was 20 centimeters long. 2. ** Answer Analysis ** - When one end of the bamboo pole was inserted into the water, the soaked part was the depth of the swimming pool. When the bamboo pole was turned around and inserted into the water again, the soaked part was also the depth of the swimming pool. The parts that weren't submerged in the water were different, and the parts that were soaked in the water overlapped. The difference between the two wet parts (100 - 20 = 80 cm) was the depth of the swimming pool. ** 2. Put a bamboo pole into the water. The wet part is 1.2 meters. Turn around and put one end into the water. At this time, only half of the bamboo pole is 0.2 meters dry. How long is this bamboo pole?** 1. ** Answer Analysis ** - Let the length of the bamboo pole be x meters. The first time it was inserted into the water, it was soaked 1.2 meters. The second time it was inserted into the water, the part that was soaked was also the depth of the swimming pool. Because only half of the 0.2 meters after the two penetrations was dry, the equation could be obtained as x - 1.2 - 1.2=<frac{x}{2}+ 0.2>. - First, simplify the equation to <<x>-<frac{x}{2}>=1.2 + 1.2+0.2>, which is <<frac{x}{2}>=2.6>, and the solution is <x = 5.2> meters. In general, the key to solving this kind of application problem was to understand the situation of the bamboo pole inserted into the water, analyze the relationship between the wet part and the unwet part during the two inserted processes, and solve the water depth or the length of the bamboo pole through reasonable calculations or equations. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Elementary school second-grade mathematics application questions skillfully answer skills
1. [Backward Inference Method: For example, in some problems regarding quantity changes, if you know the final remaining quantity and the situation of each change, you can gradually calculate the initial quantity from the back to the front.] For example, the number of items left after a certain operation could be gradually restored to the initial state from the final state by analyzing whether the number of items increased or decreased with each operation. 2. ** Analyzing the topic structure ** - ** Search for conditions and problems **: Find out the known conditions and the problems that need to be solved. This helped to sort out the train of thought and determine the direction of the problem. For example, in a question involving the price, quantity, and purchase of multiple items, one had to be clear about the meaning of each data and its connection to the question. - ** Distinguish the type of question **: Decide if it is a simple addition, multiplication, or division problem, or a mixed calculation problem. Different types of problems had different ways of solving them. For example, addition and substitution were used to calculate the increase and decrease of numbers, and multiplication and division were used to calculate the relationship between multiple factors or average scores. 3. ** Using a simple algorithm (when possible)** - ** Same factor **: If there is a same factor in the question, you can calculate the difference of the factor first and then multiply it by this factor. For example, when comparing the difference between two pens with the same number but different boxes, if the number of pens in each box is the same, the difference in the number of boxes can be calculated first and then multiplied by the number of pens in each box. - ** Multipliers **: For questions involving the relationship of multiple, you can first calculate the difference of the multiple and then multiply it by the basic number. For example, given the multiple relationship between the number of storybooks and art books, when finding the difference between the two, one could first find the multiple difference and then multiply it by the number of storybooks. 4. ** Read more questions to understand the meaning of the questions **: If you are illiterate and have difficulty reading the questions, you can ask your parents to help you read the questions. During the process of reading the questions, he could better understand the situation and requirements described by the questions and find the solution. 5. ** Practice diligently and correct errors **: Through a large amount of practice, improve the ability to solve different types of applied questions. At the same time, establish a correction book to record the areas that are prone to errors. Constantly summarize experience and improve the accuracy and speed of answering questions. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Elementary school fifth grade first volume lecture record
The following is a lecture record on the calculation of the surface area of the first volume of the fifth grade elementary school (review class): * * 1. Basic Information ** - [Time: Second quarter] - [Location: × × School] - Grade: Fifth Grade - [Task: Calculating the Area of Polygon (Refresher)] - Instructor: Not mentioned - Lecturer: Not mentioned * * 2. Teaching process ** 1. * * Classes, Daily Roar and related activities ** - At the beginning of the class, the students would first have a "Roar of the Day", followed by a "Roar of the Day" review. - Next was the "Climbing the Blackboard" segment: - The students with odd numbers wrote the area formula of a rectangular shape, while the students with even numbers wrote the area formula of a square. - After writing, they corrected each other and then memorized each other. - The group memorized the formula and tested each other. 2. * * Learn a little ** - Let the students study alone first. - Then, they corrected each other and helped each other. - The team leader would set the questions and correct each pair. - The team leader reported the test results. 3. * * Think about it: calculate the area of each figure ** - Students first learn to calculate the area of each figure. - The couplet is changed. - The team leader exchanged for a spot check. - The group leader would set the questions and test them, including the group leader setting the questions and correcting the pairs. 4. * * Practice a little ** - After the students finish the exercises individually, they will correct each pair. - The small group demonstration was mainly to solve common problems and find easy mistakes. 5. * * Detected ** - The Class C students climbed the blackboard to do the test questions while the other students completed them on the study case. - Later, the two pairs changed each other. * * 3. Comprehension in class ** The teacher was worthy of being the senior of Du Langkou's teaching. The audience learned a lot from him. Compared to their own classes, the students found themselves lacking: 1. The assignment of tasks in the class guide needed to be further strengthened because students could not always complete the tasks within the specified time. They often had to use noon or evening practice time to complete them. 2. He had to increase the cultivation of students 'initiative in learning. In his own classroom, most of the students were passive in learning. They had not yet developed the habit of taking the initiative and showing their boldness. They were always forced to learn by the teacher or the team leader. 3. The control of the classroom was not good enough. Occasionally, there would be students who were listless and sounded bored. They needed to learn from the teacher how to control the 45-minute class. 4. The system and training between groups and pairs were not enough. The audience intended to take the following measures to improve: - Carefully organize the teaching materials, do the revision work at the end of the semester, and prepare every lesson to help the students prepare for the exam. - To strengthen class management, pay attention to correcting students 'appearances in class in time, and help students regulate their speech and behavior. - To further communicate with the students, adjust the shortcomings in the teaching, improve the classroom according to the students 'interests, and increase the enthusiasm of the students. The novel "Winter in Hokkaido" is equally exciting. Everyone is welcome to click and read it!
Elementary school mathematics second grade second volume corner understanding
In the second volume of the second grade of elementary school mathematics, the understanding of angles included the following contents: 1. ** The definition and composition of an angle ** - An angle was a geometric figure formed by one or more rays intersecting at a common end point. This common end point was the apex of the angle. The rays that formed the angle were called the sides of the angle. The angle was usually represented by the symbol "". For example, ABC represented the angle ABC. A corner had one apex and two sides. 2. ** Horn classification ** - ** Right angle **: An angle equal to 90 degrees is a right angle. One could use the right angle on a triangular ruler to compare to determine whether a corner was a right angle. - ** Sharp angle **: An angle less than 90 degrees is an acute angle. For example, when the hour hand is at 10, 20, 10, or 110, the angle formed by the minute hand and the hour hand is an acute angle. - ** Obtuse angle **: An angle greater than 90 degrees but less than 180 degrees is an obtuse angle. For example, when the hour hand is at 40, 50, 70, or 80 degrees, the angle formed by the minute hand and the hour hand is an obtuse angle. 3. ** Comparing the sizes of the horns ** - The size of the angle depended on the angle between the two rays. The larger the angle, the larger the angle. When comparing the size of an angle, one could use the overlapping method. First, the two vertexes were aligned, and then one side of the two angles overlapped. Looking at the position of the other side, the corner of the other side on the outside was large, the corner of the other side was the same size, and the corner of the other side on the inside was small. 4. ** Angular measurement and tools ** - The most basic unit of measurement for angles was degrees, which divided a circle into 360 degrees. The tool used to measure the angle was a protractor. The protractor had two inner and outer scale rings, corresponding to 0 degrees and 180 degrees respectively. When using a protractor to measure an angle, the center point of the protractor should be coincided with the apex of the angle, and the 0 degree scale line should be coincided with one side of the angle. Eyes should be aimed at the inner scale circle of the protractor, and the corresponding degree of the other side should be found, which is the size of the angle. At the same time, attention should be paid to the accuracy. Try to choose a suitable protractor or measure the average value many times. 5. ** A corner in life ** - On the clock, the minute hand and hour hand formed different angles at different times. For example, at 30 or 90 hours, the angle formed by the minute hand and hour hand was a right angle; at 3:30 in the afternoon, the angle formed by the minute hand and hour hand was a right angle. 6. ** Corner related teaching activities ** - Students could learn how to recognize and compare the sizes of the horns through folding paper. For example, the teacher would ask the students to prepare a square piece of paper before class. After class, the teacher would first use the pictures in the class to find the corner with the child, and then find the corner in the classroom. When the students had an understanding of the corner, the students would fold a corner themselves, and then try to compare whose corner was bigger. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>