| 1) | -7 - -6 - -20 | 2) | -3 + 3 + 15 |
| 3) | -10 + 2 + 23 | 4) | 6 + 1 - 12 |
| 5) | 13 + 9 + 15 | 6) | -2 + 3 + -15 |
| 7) | 4 + 2 + -8 | 8) | 14 - -1 + 16 |
| 9) | -8 + 6 + -23 | 10) | -5 - -9 - -5 |
| 11) | 12 + 3 + 20 | 12) | 14 + 7 + -23 |
| 13) | 10 + 1 - 17 | 14) | 1 - -3 - -8 |
| 15) | -5 + 5 + -18 | 16) | -3 - -9 - 11 |
| 17) | 1 - -10 - 13 | 18) | 14 - -10 - -9 |
| 19) | 13 + 5 + 1 | 20) | 5 + 8 + 16 |
| 21) | 9 - -1 + -9 | 22) | -6 + 3 + 16 |
| 23) | 6 - -7 - 14 | 24) | 3 + 10 + 15 |
| 25) | -10 - -3 - 21 | 26) | 7 - -2 - -6 |
| 27) | 6 - -7 - 22 | 28) | 10 + 3 + 10 |
| 29) | -3 - -7 - -9 | 30) | -5 + 3 + -5 |
| 31) | 4 - -9 - 4 | 32) | 13 + 5 + 13 |
| 33) | 12 + 4 + -16 | 34) | -1 - -10 - 7 |
| 35) | -4 - -7 - -1 | 36) | -3 + 9 + -5 |
| 37) | 9 - -4 - -16 | 38) | 7 - -3 - -6 |
| 39) | 12 + 9 + 23 | 40) | -3 + 6 + 21 |
Joke:
If a mathematician became a farmer, he would grow carrots with square roots and adopt swine and coswine with high-pot-in-use!