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!

1. 20 + (-11) = -() + 20.

2. (-5) + (-8) = (-8) + ().

3. (-3) + 12 = + (-3).

4. State True/False : (-11) + (-8) = (-8) + (-11).

5. State True/False : -7 + 2 = 2 + (-7).

6. State True/False : (-33) + 8 = 8 + (-33).

7. 0 + (-95) = .

8. -611 + = -611.

9. + 0 = any integer.

10. 0 + (-140) = .

11. -603 + 603 = .

12. 9847 + (-9847) = .

13. 1652 + (-1652) = .

14. -777 + = 0.

15. + 5281 = 0.