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Help solve 30 problems of addition and subtraction in kindergarten classes,
1, two little rabbits jump on the grass first, then three little rabbits jump. Now, how many rabbits are there on the grass? 2+3=5

Two of the five rabbits on the grass were tired of playing and went home first. How many rabbits are there on the grass now? 5-2=3

Four ducks are swimming in the river, and three ducks swim in. How many ducks are there in the river? 4+3=7

4.8 lions plus 2 lions. How many lions? 8+2= 10

But two lions went home first at the dance, so how many are left? 10-2=8

Teach children arithmetic like this!

3+(

)=4

5+(

)=7

(

)+2=5

(

)+6= 10

7-(

)=3

(

)-2=8

5-(

)= 1

(

)

-3=6

Anyway, it is within 10.