Doubles to 20.

1. Doubles

2. 1 + 1 = 2

3. 2 + 2 = 4

4. 3 + 3 = 6

5. 4 + 4 = 8

6. 5 + 5 = 10

7. 6 + 6 = 12

8. 7 + 7 = 14

9. 8 + 8 = 16

10. 9 + 9 = 18

11. 10 + 10 = 20

12. Now try
these.

13. 8 + 8 =

14. 4 + 4 =

15. 1 + 1 =

16. 6 + 6 =

17. 3 + 3 =

18. 9 + 9 =

19. 2 + 2 =

20. 5 + 5 =

21. 10 + 10 =

22. 7 + 7 =

23. 9 + = 18

24. 4 + = 8

25. 10 + = 20

26. 8 + = 16

27. 1 + = 2

28. 3 + = 6

29. + 7 = 14

30. + 2 = 4

31. + 5 = 10