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.