is - 1 15. is -5 17. is 8 19. is -6 21. is 5 23. is -5 25. is -7 27. is -45
On the second sheet: 1. is -1 3. is -5 5. is 9 7. is -7 9. is 4 11. is 8 13. is 0 15. is -6 17. is -1 19. is 0 21. is 15 23. is -9 25. is 11 27. is -4 29. is 11 31. is 10
(Tip: The questions where it's "something - (-something)", is the same as "something + something", two minuses make a plus. Also, "something + (-something)" is the same as "something - something", a plus and a minus make a minus. Finally, the normal "something - something" questions is the same as finding the difference between the two numbers and sticking a minus in front of it, if the second number is bigger than the first. For example, 2 - 7. The difference is 5, and because the second number (7) is bigger than 2, you stick a minus in front (-5). However, if it was 7 - 2, it would just be 5.)
