Process: review geometry first.

Teacher: "Gourd", where does it make sound? Who is sleeping? (display 1) Oh, it's a graphic baby. What graphics are there?

It's time for the graphic baby to get up, and the performance will begin soon!

The graphic baby has already started to perform. Can you still recognize them? (as shown in figure 2)

Second, review the conservation of quantity

It was a group performance just now, and then there will be a group performance.

The first group goes on stage: what combination are they? What is the number and formation of participants? (same number and length)

The second group goes on stage: what combination are they? What is the number and formation of participants? (The same number is not equal in length)

The third group goes on stage: what combination are they? What is the number and formation of participants? (Different numbers of equal length)

The fourth group goes on stage: what combination are they? What is the number and formation of participants? (The length of isomeric numbers is unequal)

Among different graphic babies, which shape has the most graphic babies? how do you know

Third, review the number and addition in overlapping graphs.

Teacher: There are both group performances and group performances. Some graphic babies are a little anxious. They still have their own unique performance skills. Who was the first to perform stunts? (Show triangle)

Baby Triangle said, "I can play tricks besides acting, don't you believe it?" Look: Turn the second and third triangles respectively. Let the children talk about how many triangular hearts there are now.

Fang Baobao is a little unconvinced: "You can do magic, and I have more powerful tricks. Do not believe you. "

Fourth, the game: graphic baby juggling.

Squares and triangles have great skills, and other graphic babies quietly discuss and shake out tricks. What will they become? Look: What have nine oval babies become?