Activity purpose

1. Learn to enumerate subtraction formulas by combining physical objects and perceiving the relationship between the total number and the partial number.

2. Actively participate in activities and analyze mathematical problems according to the game plot.

Activities to be prepared

1. Children's book mathematics.

2. A magnetic blackboard; 7 kittens with magnetic teaching aids.

There are several formula cards within 3. 7.

Activity process

1. Play hide-and-seek and learn the subtraction of 7.

Show it to seven kittens. Q: What's the number of seven kittens? Let the children play hide-and-seek with the kittens: the children close their eyes and the teacher hides some kittens quietly. Then please tell the children how many kittens are hiding in it. How did you work it out? List the subtraction formulas and let the children discuss the meaning of each number and negative sign.

T: "The teacher brought a small animal today. What do you think it is? "

T: "that's right! It's a kitten. Excuse me, how many kittens have I brought? "

T: "hmm! How clever you are! How to write 7? Come, let's make a gesture together. "

T: "Now, kittens will play hide-and-seek with children!"

T: "How do you play hide and seek?"

T: "By the way, close your eyes. Now the teacher asks you to close your eyes and don't peek. The kitten is going to hide. "

T: "well, let's open our eyes."

T: "Are there any kittens on our blackboard? How many kittens are hidden? Who can tell me? "

T: "How do you know?"

T: "Oh, there are always seven kittens. Subtract the kitten on the blackboard and it is the hidden kitten. Do other children think it is right? "

Repeat the game and practice the subtraction of 7. Teachers can adjust games at any time according to children's interests. For example, let children hide kittens, or hide kittens behind children.

T: "Now the teacher wants to ask the children to help hide the kitten. Who wants to? "

T: "How many kittens are you going to hide? Tell me secretly, don't let them hear. "

... (ditto) ...

T: "The game is over. The children are very powerful! "

T: "One ***7 kittens, there are 6 left on the blackboard, and I hid ... (1) ..." Write "7-[d1] 6 =1"on the blackboard.

..... and so on until "7- 1 = 6" is written on the blackboard.

T: "Now we have so many formulas on the blackboard, what have you found?"

Write "1+6=7" on the blackboard until "6+ 1=7".

2. The game of "Finding Friends by Points" consolidates the addition and subtraction within 7.

At the beginning of the game, the teacher gave the order: "one, two, three." After reading "three", hold up a formula card, and the player can quickly calculate the numbers.

T: "The teacher turned all the formulas on the blackboard into small cards. Look! I want to play a little game with you. The teacher randomly selected one of the cards. You tell me what the formula on the card is, and I want to see which child speaks quickly and accurately. "

T: "XX's answer is very good. I asked him to draw cards for you! " "

Invite more children and play more games.

3. Children's operation.

Children practice by operating the "subtraction of learning 7" on page 8 of the children's book Mathematics.

Make a teaching aid similar to page 8.

T: "I want to see if you really have it."

T: "Is there a lot of fruit on it? 7 Yin Tao, 7 pears ... "

T: "Are some fruits marked with a black diagonal line? Eat the fruit that has crossed. "

T: "Seven Yin Tao ate 1, how many are left?" Write 7- 1 = 6 on the blackboard.

... (ditto) ...