| 1) | 4 + 4 + -13 | 2) | 6 - -8 - 9 |
| 3) | 9 - -3 - 8 | 4) | -1 + 3 + -17 |
| 5) | 6 - -9 - -6 | 6) | -4 + 9 + 15 |
| 7) | 4 - -8 - 10 | 8) | -3 + 6 + -3 |
| 9) | -5 + 3 + 22 | 10) | -9 - -9 - 9 |
| 11) | 3 + 10 + 4 | 12) | -7 - -10 - -4 |
| 13) | 1 + 7 + 7 | 14) | -3 - -1 + -13 |
| 15) | 9 - -5 - 23 | 16) | 11 + 1 - -20 |
| 17) | -1 - -6 - -7 | 18) | -9 + 8 + -11 |
| 19) | -3 - -7 - -23 | 20) | 1 - -9 - -14 |
| 21) | 3 + 7 + -16 | 22) | 3 - -7 - 17 |
| 23) | -3 + 9 + 24 | 24) | 9 - -5 - -7 |
| 25) | -4 + 6 + 8 | 26) | 3 - -3 - 8 |
| 27) | 8 - -3 - -7 | 28) | -1 - -3 - -15 |
| 29) | 14 + 3 + -19 | 30) | 7 + 10 + -22 |
| 31) | 5 - -2 - -9 | 32) | 10 - -10 - 1 |
| 33) | 4 - -7 - -13 | 34) | 3 + 10 + 17 |
| 35) | -10 - -4 - -11 | 36) | -1 - -2 - 19 |
| 37) | -12 - -7 - -17 | 38) | 4 + 4 + 18 |
| 39) | 5 + 4 + -10 | 40) | 13 - -9 - -4 |
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!