1. On the basis of operating objects, understand the division and combination of 5. Willing to express their operation results in words.

2. Try to record your operation results with numbers.

3. Cultivate children's interest in learning mathematics.

4. Be able to think positively and improve understanding and calculation ability.

5. Cultivate children's observation, analysis and hands-on ability.

Highlights and difficulties of the activity:

On the basis of operating physical objects, understand the division and combination of 5.

Try to record your own operation results with numbers.

Activity preparation:

1. Courseware, an envelope and five peanuts.

2. Operate 1 card and marker.

Activity flow:

First, the beginning part:

The game "Touch the Ball" (review the composition of 4).

Second, integration.

Teacher: Today, the teacher prepared a small gift for the children. Let's take a look. What is this?

How many peanuts did the teacher give the children? Let's count together.

The children are counting on small chairs. (Put away the peanuts after counting)

Please talk to individual children.

Third, the child operates for the first time.

1. Show the courseware.

Teacher: I want to give five peanuts to Fang Bao and Yuan Bao. How should I divide it? What do they mean? Let the children taste the peanuts, will you?

2. Children's surgery.

(1) Teacher: "How to divide it?"

Individual children said. Show the corresponding courseware according to what the children say.

(2) "Children who have something in common with her put their hands up, you are great".

A reading mode suitable for children.

(3) Teacher: Who else is different from them?

Individual children said. (Children with the same score raise their hands)

(4) "The teacher sorted out the main points of the children. Let's read it together. "

Show all the combinations and read in groups.

Fourth, further understand the division of 5 in order.

Teacher: The teacher wants a piece of the action, too. If our baby gets one, how many should the round baby get? (Show the corresponding courseware)

Teacher: There are two square babies. How many round babies are there? (3) Did you find anything? There is one more in the front and one less in the back, and the latter runs to the front. )

Children's collective reading is divided into two parts.

Fifth, the second operation for children.

Teacher: Today we learned a score of 5, and the teacher will test you. (Courseware showing children's operation materials)

(1) Recognize the signs inside and outside the circle.

Teacher: Small animals want to play the game of rings. What do you think of this symbolic ring? How's this? It wasn't trapped, it fell outside.

(2) The teacher demonstrates an assignment.

Teacher: Piglet plays the game of several circles. (5) Set several circles and use numbers to represent them. (Write numbers) Drop a few outside and use numbers to represent them.

(3) Further understand the point and sum of 5.

Teacher: What are these five circles divided into? What's their total number? (The child says)

(4) When it comes to requirements, children have to do three homework.

Teacher: Other small animals circled several times. How many were caught and how many remained outside? Let's count it and record it in figures, shall we?

Children operate and teachers guide them.

Sixth, evaluate children's homework.

(1) Children comment on each other.

(2) Teachers collectively evaluate children's homework.

According to children's own grades, combined with courseware arrangement, several methods to consolidate the division of review 5.

Activity reflection:

In today's math "Learning Composition 5"

I asked the children to take five peanuts, and then divided them into two parts and put them on the homework list. Each time I got a different part. After grading, check whether there is repetition or omission, and finally record the grading results, and then talk about your own achievements and share them. Through this interesting physical operation, children naturally understand the composition of 5. Then I asked the children to observe and discuss together, find out the rules and talk about how to remember the composition of numbers faster. While affirming the children's thoughts, I further guided the children to discuss which method is better, simpler and easier to remember, and find out the best one. In this kind of hands-on operation, children not only mastered 5 compositions, but also exercised their language expression and thinking ability and cultivated their innovative consciousness.

Encyclopedia: 5 is a natural number between 4 and 6, the third prime number, and the fourth, eighth and 10 decimal places of pi.