Activity objectives:
1, feel the rich changes of numbers, experience the fun of operation, and improve children's ability to add and subtract questions within 10.
2. Help children sort out, summarize and find simple ways to do oral calculations.
I miss my teachers and peers, and I am full of expectation to keep in touch with my peers after graduation.
Activity preparation:
1, each person has an envelope containing the mobile phone password to be decrypted.
2, each person a homemade password operation paper, pen.
3. Remember your home phone number and PPT in advance, and bring a one-inch photo to your child.
Activity flow:
First, import
Teacher: We lived together in kindergarten for three years. Soon, you will leave kindergarten and become glorious pupils. Will you miss your teacher? Then how do you contact the teacher?
(Children talk about various ways of communication: writing letters, texting, chatting online, and making phone calls)
Second, decrypt the phone number, review the addition and subtraction operations within' 10, help the children sort out and summarize, and find a simple method of oral calculation.
1, Teacher: There are so many ways to contact me. I'll tell you my phone number now. My phone number is right here (showing PPT). This number is not easy for you to get. This is a set of passwords that need to be decrypted so that you can get my phone number. (Show Formula Questions)
2. Children's first operation
Teacher: The teacher has prepared a small envelope for you, which contains eight password questions I have sorted out. Please help me decrypt the phone number with a pen in the future. Everyone is holding their envelopes gently. Let's decrypt them together and see who moves faster. There must be rules in the game. Listen to the rules:
(1) A gentle mouth does not affect others.
(2) When decrypting numbers, you should see the addition and subtraction symbols of the formula clearly, and you should not be careless.
(3) Please raise your hand after decryption.
3. Teachers' itinerant guidance.
4. What's the phone number of the teacher's home? (Ask the children to announce the answer)
The teacher checks the answers, and the children collectively discover and discuss the rules.
In the (1) addition formula, the number of two-digit exchange positions before and after the+sign is the same.
(2) The same formula problem will not be repeated, which will speed up the calculation.
Thirdly, the decryption number is calculated again by using the method obtained above.
Teacher: Let's see whose phone number we want to decrypt now. (Show another teacher's phone password PPT)
1. Why is there a boy and a girl on it? (Boys decrypt boys' scores and girls decrypt girls' scores)
2, the child's second operation: the teacher repeats the rules.
3, children's collective observation and discussion concluded that:
(1) If you add 0 (or subtract 0) to the formula, this number is equal to this number.
(2) The numbers before and after the minus sign in the formula are the same, and the number is 0.
Third, children use their own phone numbers to write addition and subtraction questions within 10.
1, Teacher: You are really amazing. You have solved all the secrets that the teacher hid in the calculation problem. Now that we have the teacher's phone number, do you want to ask for the phone number of your good friend? (thinking)
2. Teacher: We record our home phone number in the form of a password, which can be simpler or more difficult. Remember, you can't write your home phone directly. It's too simple. After recording, exchange passwords with your friends, unlock your friends' passwords, and you can get your friends' phone numbers.
3, children's third operation, the teacher tour guidance.
(1) Remind children to use the methods they have learned above to make passwords.
(2) Exchange compiled passwords.
4, small game: make a phone call
Fourth, exchange phone numbers.
1, it seems that everyone is smart enough to decrypt the phone number of a good friend so quickly. Now please exchange phone numbers with each other and remember to keep in touch often after graduation.
2. Children can exchange phone numbers freely, and the activity is over. Ask the child to call home at night to verify whether the number is correct. If there are any mistakes, please come to the kindergarten tomorrow to correct them. )