九九乘法
| 2 x 2 = 4 | 2 x 3 = 6 | 2 x 4 = 8 | 2 x 5 = 10 | 2 x 6 = 12 | 2 x 7 = 14 | 2 x 8 = 16 | 2 x 9 = 18 |
| 3 x 2 = 6 | 3 x 3 = 9 | 3 x 4 = 12 | 3 x 5 = 15 | 3 x 6 = 18 | 3 x 7 = 21 | 3 x 8 = 24 | 3 x 9 = 27 |
| 4 x 2 = 8 | 4 x 3 = 12 | 4 x 4 = 16 | 4 x 5 = 20 | 4 x 6 = 24 | 4 x 7 = 28 | 4 x 8 = 32 | 4 x 9 = 36 |
| 5 x 2 = 10 | 5 x 3 = 15 | 5 x 4 = 20 | 5 x 5 = 25 | 5 x 6 = 30 | 5 x 7 = 35 | 5 x 8 = 40 | 5 x 9 = 45 |
| 6 x 2 = 12 | 6 x 3 = 18 | 6 x 4 = 24 | 6 x 5 = 30 | 6 x 6 = 36 | 6 x 7 = 42 | 6 x 8 = 48 | 6 x 9 = 54 |
| 7 x 2 = 14 | 7 x 3 = 21 | 7 x 4 = 28 | 7 x 5 = 35 | 7 x 6 = 42 | 7 x 7 = 49 | 7 x 8 = 56 | 7 x 9 = 63 |
| 8 x 2 = 16 | 8 x 3 = 24 | 8 x 4 = 32 | 8 x 5 = 40 | 8 x 6 = 48 | 8 x 7 = 56 | 8 x 8 = 64 | 8 x 9 = 72 |
| 9 x 2 = 18 | 9 x 3 = 27 | 9 x 4 = 36 | 9 x 5 = 45 | 9 x 6 = 54 | 9 x 7 = 63 | 9 x 8 = 72 | 9 x 9 = 81 |