| 1) | -3 - -5 - 13 | 2) | -3 - -1 + -24 |
| 3) | -12 + 8 + 21 | 4) | 2 - -6 - 9 |
| 5) | -4 - -2 - -20 | 6) | 12 + 9 + -9 |
| 7) | -11 - -3 - 17 | 8) | 10 + 10 + -8 |
| 9) | -11 - -9 - 10 | 10) | -6 - -7 - -10 |
| 11) | 14 + 7 + -21 | 12) | 1 + 6 + -7 |
| 13) | -7 - -3 - 24 | 14) | -8 - -8 - 23 |
| 15) | -11 - -6 - -16 | 16) | 11 - -9 - 19 |
| 17) | -2 - -7 - -6 | 18) | -12 - -5 - 21 |
| 19) | 9 + 10 + 9 | 20) | 10 + 5 + 5 |
| 21) | -5 + 8 + -22 | 22) | 7 - -6 - 4 |
| 23) | 2 + 8 + 4 | 24) | -3 + 6 + 0 |
| 25) | 6 + 8 + 15 | 26) | 8 - -9 - -18 |
| 27) | 6 - -7 - -19 | 28) | -9 + 5 + 17 |
| 29) | -5 - -1 + 2 | 30) | 10 - -5 - 21 |
| 31) | -3 + 3 + 1 | 32) | 3 - -8 - 2 |
| 33) | 5 - -4 - 24 | 34) | -3 - -1 + -22 |
| 35) | 4 - -2 - -12 | 36) | -3 - -4 - 21 |
| 37) | -2 - -2 - 15 | 38) | 2 + 8 + 24 |
| 39) | -6 - -9 - 24 | 40) | -4 + 8 + -11 |
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!