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. (2 * 5) + (4 * 5) = .

2. (6 * 10) - (6 * 5) = .

3. (-6) * 5 = .

4. State True/False : ( 8 - 13) * 7 = 8 - (13 * 7). .

5. State True/False : [(-6) - (8)] * (-4) = (-6) - [ (8) * (-4)]. .

6. State True/False : 3 * [(-4) + (-10)] = [ 3 *(-4) + 3 * (-10)] .

7. Sign of the product of 16 times of negative integers will be .

8. Sign of the product of 29 times of negative integers will be .

9. State True/False : (-15) * 5 = 75.

10. State True/False : (-100) * 0 * 20 = 0.

11. State True/False : 8 * (-4) = 32.

12. -80 * = -80.

13. (-10) * = 20.

14. 100 * = -500.

15. * (-9) = -45.

16. * 75 = 0.