K3---Sums within 20
Sums within 20;
Today is Thursday, December 13th.
We learned sums within 20.
Q: What are these animals?
A: They are dinosaurs.
Q: How many dinosaurs are there in the forest?
A: There are five dinosaurs in the forest.
Let's learn about the dinosaur bones.
They are skull and teeth.
They are plates.
They are ribs.
Q: What are these tools?
A: They are shovel, hammer, fork and brush.
We can use tools to find dinosaur bones.
Professor finds some dinosaur teeth, let's help him to count.
There are 10 teeth in the blue tray，there are 3 teeth in the red tray.
Q: How many teeth did professor find altogether?
Q: What is 10 and 3 more?
A: 10 and 3 more is 13.
Q: What is the sum of 10 and 3?
A: The sum of 10 and 3 is 13.
A: So there are 13 dinosaur teeth altogether.
Let's count dinosaur plates.
There are 17 plates altogether and some of them are missing. 10 and what number is 17?
Start with 10, we count on 7 more to get to 17. 10 and 7 more is 17. So we need 7 more plates.
Next, let's check all the tools.
18 tools are loaded on the truck. 10 of them are forks.
Q: How many tools are there on the left side? What number and 10 more is 18?
A: Start with 8, we count on 10 more to get to 18. 8 and 10 more is 18. So there are 8 tools on the left side.
本课教学目标:
运用估算法尝试解决问题；
学习20以内的加法，其中一个加数为10；
运用20以内加法解决课件中的数学问题。
课后：
根据语音进行复习。