| 1) | 6 - -9 - 10 | 2) | -6 + 3 + 10 |
| 3) | 7 + 6 + -9 | 4) | -11 + 8 + -11 |
| 5) | 4 - -2 - -12 | 6) | 3 + 3 + -2 |
| 7) | -3 - -10 - -21 | 8) | -4 + 9 + -4 |
| 9) | 2 - -1 + -9 | 10) | 1 + 1 - 19 |
| 11) | 2 - -5 - -12 | 12) | -3 - -4 - -24 |
| 13) | 1 + 8 + 9 | 14) | 5 + 2 + 18 |
| 15) | -5 - -7 - -15 | 16) | 4 + 8 + 13 |
| 17) | 1 - -2 - -19 | 18) | -2 + 5 + 21 |
| 19) | 6 + 3 + 3 | 20) | 3 - -10 - -7 |
| 21) | -2 + 6 + 21 | 22) | 1 + 5 + 20 |
| 23) | 10 + 8 + -1 | 24) | -1 - -4 - -10 |
| 25) | -5 - -1 + 6 | 26) | -2 - -7 - -17 |
| 27) | 9 - -7 - -2 | 28) | 11 - -7 - -17 |
| 29) | 9 + 7 + -5 | 30) | -3 + 9 + -15 |
| 31) | 7 - -10 - -1 | 32) | 14 + 8 + 19 |
| 33) | 8 - -6 - -21 | 34) | 9 + 10 + -7 |
| 35) | 7 + 3 + 16 | 36) | -3 - -7 - -4 |
| 37) | 2 - -3 - -12 | 38) | -4 - -6 - 19 |
| 39) | 3 - -3 - 24 | 40) | 13 + 5 + 22 |
Joke:
If your father was a mathematician, he would warn you in the form of 'I told you n times; and I told you n+1 times' and so on!