1. (-1) × (-1) × (-1) × ......... 10 times is equal to

2. (-1) × (-1) × (-1) × ........ 5 times is equal to

3. (-1) × (-1) × (-1) × ...... 2 m times, where m is a natural number, is equal to

4. (-20) × (-5) is equal to

5. (-30) × 20 is equal to

6. 10 × (-20) is equal to

7. 3 × 0 is equal to

8. 0 × (-5) is equal to

9. (-2) × 1 is equal to

10. 1 × 6 is equal to