Number System

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
11. State True/False : The additive inverse of (-32) is -32. .

12. State True/False : (-90) + (-30) = 60.

13. State True/False : (-125) + 25 = -100.

14. -9 + (-5) + 6 = .

15. 8 + (-12) -6 = .

16. -4 + 2 + 10 = .

17. 10 + (-4) + 8 = .

18. (-10) + (+7) = .

19. (-8) + 10 + (-2) = .

20. 20 + (-9) + 9 = .

21. (-6) - (-2) (-6) + 2.