Subtraction: Adding UP

1. Subtraction: Adding UP

2. Category 1 The whole is a multiple of ten.

3. 20 – 15 20 – 14 20 – 12 20 – 11

4. 20 – 10 20 – 9 20 – 7 20 – 8

5. 30 – 25 30 – 23 30 – 15 30 – 12

6. 30 – 19 30 – 14 30 – 24 30 – 21

7. 40 – 34 40 – 29 40 – 20 40 – 18

8. 40 – 32 40 – 28 40 – 19 40 – 24

9. 50 – 39 50 – 44 50 – 24 50 – 33

10. 60 – 49 60 – 29 60 – 39 60 – 19

11. 70 – 59 70 – 34 70 – 49 70 – 18

12. Category 2 The whole is a no longer multiple of ten but is below fifty.

13. 15 – 9 15 – 9 15 – 9 15 – 9

14. 21 – 10 21 – 9 21 – 7 21 – 8

15. 25 – 19 25 – 16 25 – 18 25 – 9

16. 23 – 19 23 – 16 23 – 14 23 – 9

17. 31 – 29 31 – 26 31 – 24 31 – 15

18. 32 – 28 32 – 25 32 – 19 32 – 15

19. 44 – 39 44 – 35 44 – 29 44 – 25

20. 41 – 34 41 – 28 41 – 24 41 – 19

21. 23 – 19 33 – 19 42 – 29 41 – 18

22. Category 3 Mixture of numbers that lend themselves to the Adding Up Strategy

23. 20 – 14 24 – 19 22 – 13 26 – 17

24. 30 – 15 33 – 19 33 – 14 36 – 27

25. 40 – 19 45 – 19 42 – 23 42 – 34

26. 50 – 24 50 – 39 56 – 28 56 – 17

27. 60 – 49 60 – 27 63 – 56 63 – 19

28. 70 – 61 70 – 34 74 – 49 74 – 36

29. 80 – 39 80 – 68 81 – 49 81 – 58

30. 90 – 79 90 – 74 92 – 89 92 – 69

31. 100 – 97 100 – 89 100 – 49 100 – 24