1. (    ) - 3 = 7

2. 14 + 19 = (    )

3. (    ) - 2 = 14

4. 3 + 20 = (    )

5. 16 - 9 = (    )

6. 11 - (    ) = 8

7. 2 + 18 = (    )

8. (    ) + 20 = 22

9. (    ) - 6 = 9

10. 2 + (    ) = 10

11. 19 - (    ) = 1

12. 1 + (    ) = 14

13. (    ) + 13 = 21

14. 18 - 4 = (    )

15. 20 + 2 = (    )

16. 17 + 18 = (    )

17. 9 + 6 = (    )

18. 5 + 3 = (    )

19. 4 + (    ) = 13

20. 8 + (    ) = 14