1. Add or Subtract? x + 5 7 =

2. Subtract x + 5 7 = – 5 – 5 x = 2

3. Check x + 5 7 = 7 5 = 2 + 7 7 =

4. Add or Subtract? y 8 16 + =

5. Subtract y 8 16 + = – 8 – 8 y = 8

6. Check 8 + y 16 = 16 8 = 8 + 16 16 =

7. Add or Subtract? y + 7
– 2 =

8. Subtract y + 7
– 2 = – 7 – 7 y
– 9 =

9. Check y + 7
– 2 = – 9 + 7 – 2 =
– 2
– 2 =

10. Add or Subtract? x – 5 14 =

11. Add x – 5 14 = + 5 + 5 19 x =

12. Check – x 5 = 14 5 19 = 14 – 14 14 =

13. Add or Subtract? y
– 8 12 + =

14. Add y
– 8 12 + = + 8 + 8 y = 20

15. Check y
– 8 12 + = – 12 + 20 = 8 12 12 =

16. Add or Subtract? m – 9
– 4 =

17. Add m – 9
– 4 = + 9 + 9 5 m =

18. Check m – 9
– 4 = – 9
– 4 5 =
– 4
– 4 =