Activity objectives:
1. Learn the decomposition of 9 and know that there are 8 ways to divide 9 into two parts.
2. Learn to record your own operation results, express your own operation process, and find the law between the two parts.
3. Cultivate the quality of unity and cooperation through group activities and enhance communication awareness.
Activity preparation:
1. Teaching aid: enlarged operation card, 9 decomposed ppt pictures.
2. Learning tools: small boxes, shopping vouchers, fruit cards, record cards and pens.
3. Experience preparation: I have learned decomposition within 8 minutes and have a preliminary grasp of the record card.
Activity flow:
First, the beginning: review the decomposition of 8 through clapping games.
Second, the basic part: composition learning 9
1. situational introduction stimulates children's interest in learning.
Teacher: Mother Rabbit's fruit shop opened today, and all the fruits in the fruit shop cost 9 yuan. Mother rabbit also prepared 8 shopping vouchers for each of our children.
2. Introduce shopping vouchers.
Teacher: What graphics are there on the shopping voucher? (Circle) One circle represents 1 yuan, and two circles represent 2 yuan money. How much is this shopping voucher? (5 yuan) Why? (Because there are five circles on it) Think about it. Which two shopping vouchers add up to 9 yuan money, just enough to buy a fruit? How many fruits can I buy in the future?
3. Children's group activities, teachers' roving observation and guidance.
(1) Each group has one shop assistant (listed). Other children go to the shop assistant to buy fruit. The clerk must strictly verify whether the child has paid 9 yuan money.
(2) Children record their purchases on cards. For example, I bought peaches with 1 yuan and 8 yuan money. I bought pears with 2 yuan money and 7 yuan money, and so on.
(3) Ask children to talk about record cards, and guide them to discover the interchange relationship.
Teacher: Who will tell you which two shopping vouchers add up to 9 yuan?
(4) Show PPT to guide children to discover the rules. Each number is divided into two parts with one division less than it, 9 has eight divisions, and so on. If arranged in sequence, the numbers on one side gradually increase, one is more than the other 1, while the numbers on the other side gradually decrease, and one is less than the other 1.
Third, the end part: help rabbits learn to stimulate children to review, consolidate and decompose 9.
Teacher: Just now, we played a fruit shop game. When we play, our children find eight ways to divide 9. Mother rabbit is very smart to look at the children in Class Two and wants our children to help Little Rabbit. Rabbit also learned the combination of 9 in kindergarten, but still can't. Please show him our children. Would you like to?
(1) Show the operation data and introduce the practice on page 12 of the children's mathematics textbook.
(2) Children do and teachers guide them.
Teacher: After you finish, check with the children next to you. There are different opinions to discuss. If you think it's okay, just give it to me. I'll show it to mother rabbit and her baby rabbit.