Mental Math Adding and Subtracting to 20

Front

What is 10 + 8?

Back

18

Front

What is 20 - 17?

Back

3

Front

Joseph has eight stamps. His parents gave him three more stamps. How many stamps does Joseph have now?

Back

11 stamps

Front

14 + ____ = 22. What number goes in the blank?

Back

8

Front

What is 20 - 10?

Back

10

Front

What is 5 + 7?

Back

12

Front

What is 15 - 6?

Back

9

Front

If you have 3 apples and you buy 4 more, how many apples do you have?

Back

7 apples

Front

What is 9 + 6?

Back

15

Front

What is 18 - 9?

Back

9