Найдем результаты умножения на 4:
Закрасим клетки с этими числами в таблице.
| 15 | 7 | 23 | 35 | 25 | 29 | 40 | 36 | 20 | 13 | 37 | 33 | 17 | 18 | 3 |
| 22 | 8 | 24 | 4 | 16 | 32 | 28 | 12 | 28 | 24 | 40 | 8 | 16 | 36 | 11 |
| 10 | 12 | 9 | 39 | 40 | 20 | 36 | 8 | 24 | 40 | 4 | 1 | 6 | 40 | 5 |
| 14 | 27 | 21 | 12 | 31 | 36 | 12 | 40 | 38 | 8 | 34 | 26 | 19 | ||
| 25 | 19 | 24 | 8 | 38 | 28 | 4 | 36 | 32 | 24 | 14 | 12 | 24 | 38 | 2 |
| 23 | 19 | 16 | 21 | 15 | 26 | 24 | 8 | 12 | 15 | 25 | 22 | 24 | 38 | 31 |
| 30 | 4 | 15 | 38 | 35 | 33 | 29 | 12 | 25 | 22 | 11 | 23 | 21 | 36 | 14 |
| 10 | 40 | 9 | 6 | 30 | 10 | 23 | 33 | 23 | 19 | 37 | 38 | 5 | 20 | 18 |
| 5 | 24 | 13 | 17 | 35 | 17 | 19 | 3 | 35 | 37 | 39 | 34 | 3 | 40 | 39 |
| 30 | 30 | 4 | 23 | 9 | 38 | 38 | 29 | 35 | 1 | 31 | 19 | 40 | 29 | 9 |
| 31 | 22 | 4 | 19 | 31 | 15 | 37 | 22 | 13 | 35 | 27 | 37 | 32 | 7 | 1 |
| 11 | 34 | 31 | 40 | 28 | 16 | 40 | 28 | 28 | 40 | 8 | 20 | 14 | 27 | 30 |
| 19 | 26 | 18 | 29 | 37 | 28 | 28 | 13 | 12 | 4 | 15 | 5 | 17 | 14 | 18 |
| 1 | 33 | 9 | 5 | 33 | 16 | 4 | 30 | 40 | 4 | 22 | 35 | 14 | 22 | 18 |
| 22 | 27 | 39 | 1 | 22 | 36 | 4 | 11 | 24 | 28 | 29 | 19 | 31 | 27 | 14 |
Ответ: закрашены числа 4, 8, 12, 16, 20, 24, 28, 32, 36, 40.