The combination of numbers, sorting, teaching plan, middle classThe following is a lesson plan for the middle class:
** 1. Teaching objectives **
1. Let the children explore the rules of the number arrangement and combination, and try to make different combinations of the given numbers to experience the fun of the number combination.
2. It will help children to perceive the use of numbers in life and understand the importance of the combination of numbers.
** 2. Teaching preparation **
1. There are several pictures of cars (for example, two red pictures of cars, one yellow picture of cars, six pictures of cars).
2. The two of them had a set of cards.
3. Pencils and white paper.
** 3. Important and Difficult Points in Teaching **
1. ** Main point **
- Master the different permutations and combinations of numbers.
2. ** Difficulty **
- Able to perform a variety of permutations and combinations on a given three numbers.
** 4. Teaching process **
#(I) Introduction
1. Conversation Introduction
- The teacher said,"There are more and more cars on the road. Cars have brought great convenience to our lives. What can we do to quickly find our own car on the road?" Guide the child to think and answer.
- The teacher continued to ask,"Other than identifying the brand, shape, and color of the car, what other methods can you use to find your own car?" This led to the concept of a license plate number.
- The teacher can ask further,"What is a license plate number?" Deepen the child's initial understanding of the license plate number.
2. situation creation
- The teacher explained,"There are two cars parked in front of the little bunny's house. It can't recognize its own car (the brand, color, and appearance are all the same). Can you help me see what's the difference between these two cars?"
- When the child realized that the license plate number was different, the teacher said,"Xiaotu suddenly remembered that its license plate number is 681. Please find this car (the numbers are arranged from left to right)." He also led the child to the conclusion that if he wanted to find his family's car, he had to look at the license plate number to know.
#(II) Exploring the Sequence of Number Combination
1. Guess the license plate number and learn the different combinations of three numbers
- The teacher created a situation: "The problem with the bunny is solved, but the bunny's father is in trouble again. Their family bought a new car today, but they don't have a license plate number yet. Now, please help me use the numbers 1, 2, and 3 to give the car a license plate number. Each number on the license plate number can only appear once." He invited a few children to come up and operate the digital card.
- The teacher and the child looked at the license plate numbers together and concluded,"The license plate numbers of these cars are arranged in a regular manner. If the number baby at the beginning is 1, then there are 2 and 3, and there are 3 and 2, which are the license plate numbers 123 and 132. If the number baby at the beginning is 2, there are the license plate numbers 213 and 231. The number at the beginning is 3, and there are two license plates, 312 and 321. There are a total of six different license plates with three numbers."
2. Children's operation to make up the license plate number
- The two children worked in pairs, and the teacher gave the children the numbers 4, 5, and 6 to arrange and combine. The teacher said,"I have a few cars here, but none of them have license plates. Now, please try to use the numbers 4, 5, and 6 to give them license plates. Each number can only appear once." He arranged for one child to place the number card and the other child to record the license plate numbers.
- The teacher collected the license plate numbers written by the children, checked if there were any repetitions, and asked if there were any different license plate numbers. Then, two sets of license plates with the same starting numbers were placed together to guide the children to find the pattern of the number arrangement and combination.
- At last, the teacher said,"Let's put these license plates on every car together."
#(3) Exploring other elements of license plates
Teachers guide children to explore the secrets of license plates other than the combination of numbers, such as Chinese characters, English letters, colors, etc., so that children understand that not only the number of license plates can be different, but other elements can also be different.
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