12x12の掛け算の九九を使用して、2つの数値をすばやく乗算します。
最初の行と最初の列から番号を選択します。
| ×× | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 2 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| 3 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 | 27 | 30 | 33 | 36 |
| 4 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | 40 | 44 | 48 |
| 5 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 |
| 6 | 6 | 12 | 18 | 24 | 30 | 36 | 42 | 48 | 54 | 60 | 66 | 72 |
| 7 | 7 | 14 | 21 | 28 | 35 | 42 | 49 | 56 | 63 | 70 | 77 | 84 |
| 8 | 8 | 16 | 24 | 32 | 40 | 48 | 56 | 64 | 72 | 80 | 88 | 96 |
| 9 | 9 | 18 | 27 | 36 | 45 | 54 | 63 | 72 | 81 | 90 | 99 | 108 |
| 10 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 |
| 11 | 11 | 22 | 33 | 44 | 55 | 66 | 77 | 88 | 99 | 110 | 121 | 132 |
| 12 | 12 | 24 | 36 | 48 | 60 | 72 | 84 | 96 | 108 | 120 | 132 | 144 |
| 1 | ×× | 1 | = | 1 |
| 2 | ×× | 1 | = | 2 |
| 3 | ×× | 1 | = | 3 |
| 4 | ×× | 1 | = | 4 |
| 5 | ×× | 1 | = | 5 |
| 6 | ×× | 1 | = | 6 |
| 7 | ×× | 1 | = | 7 |
| 8 | ×× | 1 | = | 8 |
| 9 | ×× | 1 | = | 9 |
| 10 | ×× | 1 | = | 10 |
| 11 | ×× | 1 | = | 11 |
| 12 | ×× | 1 | = | 12 |
| 1 | ×× | 2 | = | 2 |
| 2 | ×× | 2 | = | 4 |
| 3 | ×× | 2 | = | 6 |
| 4 | ×× | 2 | = | 8 |
| 5 | ×× | 2 | = | 10 |
| 6 | ×× | 2 | = | 12 |
| 7 | ×× | 2 | = | 14 |
| 8 | ×× | 2 | = | 16 |
| 9 | ×× | 2 | = | 18 |
| 10 | ×× | 2 | = | 20 |
| 11 | ×× | 2 | = | 22 |
| 12 | ×× | 2 | = | 24 |
| 1 | ×× | 3 | = | 3 |
| 2 | ×× | 3 | = | 6 |
| 3 | ×× | 3 | = | 9 |
| 4 | ×× | 3 | = | 12 |
| 5 | ×× | 3 | = | 15 |
| 6 | ×× | 3 | = | 18 |
| 7 | ×× | 3 | = | 21 |
| 8 | ×× | 3 | = | 24 |
| 9 | ×× | 3 | = | 27 |
| 10 | ×× | 3 | = | 30 |
| 11 | ×× | 3 | = | 33 |
| 12 | ×× | 3 | = | 36 |
| 1 | ×× | 4 | = | 4 |
| 2 | ×× | 4 | = | 8 |
| 3 | ×× | 4 | = | 12 |
| 4 | ×× | 4 | = | 16 |
| 5 | ×× | 4 | = | 20 |
| 6 | ×× | 4 | = | 24 |
| 7 | ×× | 4 | = | 28 |
| 8 | ×× | 4 | = | 32 |
| 9 | ×× | 4 | = | 36 |
| 10 | ×× | 4 | = | 40 |
| 11 | ×× | 4 | = | 44 |
| 12 | ×× | 4 | = | 48 |
| 1 | ×× | 5 | = | 5 |
| 2 | ×× | 5 | = | 10 |
| 3 | ×× | 5 | = | 15 |
| 4 | ×× | 5 | = | 20 |
| 5 | ×× | 5 | = | 25 |
| 6 | ×× | 5 | = | 30 |
| 7 | ×× | 5 | = | 35 |
| 8 | ×× | 5 | = | 40 |
| 9 | ×× | 5 | = | 45 |
| 10 | ×× | 5 | = | 50 |
| 11 | ×× | 5 | = | 55 |
| 12 | ×× | 5 | = | 60 |
| 1 | ×× | 6 | = | 6 |
| 2 | ×× | 6 | = | 12 |
| 3 | ×× | 6 | = | 18 |
| 4 | ×× | 6 | = | 24 |
| 5 | ×× | 6 | = | 30 |
| 6 | ×× | 6 | = | 36 |
| 7 | ×× | 6 | = | 42 |
| 8 | ×× | 6 | = | 48 |
| 9 | ×× | 6 | = | 54 |
| 10 | ×× | 6 | = | 60 |
| 11 | ×× | 6 | = | 66 |
| 12 | ×× | 6 | = | 72 |
| 1 | ×× | 7 | = | 7 |
| 2 | ×× | 7 | = | 14 |
| 3 | ×× | 7 | = | 21 |
| 4 | ×× | 7 | = | 28 |
| 5 | ×× | 7 | = | 35 |
| 6 | ×× | 7 | = | 42 |
| 7 | ×× | 7 | = | 49 |
| 8 | ×× | 7 | = | 56 |
| 9 | ×× | 7 | = | 63 |
| 10 | ×× | 7 | = | 70 |
| 11 | ×× | 7 | = | 77 |
| 12 | ×× | 7 | = | 84 |
| 1 | ×× | 8 | = | 8 |
| 2 | ×× | 8 | = | 16 |
| 3 | ×× | 8 | = | 24 |
| 4 | ×× | 8 | = | 32 |
| 5 | ×× | 8 | = | 40 |
| 6 | ×× | 8 | = | 48 |
| 7 | ×× | 8 | = | 56 |
| 8 | ×× | 8 | = | 64 |
| 9 | ×× | 8 | = | 72 |
| 10 | ×× | 8 | = | 80 |
| 11 | ×× | 8 | = | 88 |
| 12 | ×× | 8 | = | 96 |
| 1 | ×× | 9 | = | 9 |
| 2 | ×× | 9 | = | 18 |
| 3 | ×× | 9 | = | 27 |
| 4 | ×× | 9 | = | 36 |
| 5 | ×× | 9 | = | 45 |
| 6 | ×× | 9 | = | 54 |
| 7 | ×× | 9 | = | 63 |
| 8 | ×× | 9 | = | 72 |
| 9 | ×× | 9 | = | 81 |
| 10 | ×× | 9 | = | 90 |
| 11 | ×× | 9 | = | 99 |
| 12 | ×× | 9 | = | 108 |
| 1 | ×× | 10 | = | 10 |
| 2 | ×× | 10 | = | 20 |
| 3 | ×× | 10 | = | 30 |
| 4 | ×× | 10 | = | 40 |
| 5 | ×× | 10 | = | 50 |
| 6 | ×× | 10 | = | 60 |
| 7 | ×× | 10 | = | 70 |
| 8 | ×× | 10 | = | 80 |
| 9 | ×× | 10 | = | 90 |
| 10 | ×× | 10 | = | 100 |
| 11 | ×× | 10 | = | 110 |
| 12 | ×× | 10 | = | 120 |
| 1 | ×× | 11 | = | 11 |
| 2 | ×× | 11 | = | 22 |
| 3 | ×× | 11 | = | 33 |
| 4 | ×× | 11 | = | 44 |
| 5 | ×× | 11 | = | 55 |
| 6 | ×× | 11 | = | 66 |
| 7 | ×× | 11 | = | 77 |
| 8 | ×× | 11 | = | 88 |
| 9 | ×× | 11 | = | 99 |
| 10 | ×× | 11 | = | 110 |
| 11 | ×× | 11 | = | 121 |
| 12 | ×× | 11 | = | 132 |
| 1 | ×× | 12 | = | 12 |
| 2 | ×× | 12 | = | 24 |
| 3 | ×× | 12 | = | 36 |
| 4 | ×× | 12 | = | 48 |
| 5 | ×× | 12 | = | 60 |
| 6 | ×× | 12 | = | 72 |
| 7 | ×× | 12 | = | 84 |
| 8 | ×× | 12 | = | 96 |
| 9 | ×× | 12 | = | 108 |
| 10 | ×× | 12 | = | 120 |
| 11 | ×× | 12 | = | 132 |
| 12 | ×× | 12 | = | 144 |