# 乘法表

## 在初等算术中

× 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

## 习惯用法

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

### 在中国的使用习惯

 1 1 2 2 4 3 3 6 9 4 4 8 12 16 5 5 10 15 20 25 6 6 12 18 24 30 36 7 7 14 21 28 35 42 49 8 8 16 24 32 40 48 56 64 9 9 18 27 36 45 54 63 72 81 × 1 2 3 4 5 6 7 8 9

## 表中的模式

``` 2 × 6 = '12'
4 × 6 = '24'
6 × 6 = '36'
8 × 6 = '48'
10 × 6 = '60'
```

``` 數 × 6 = 該數乘以10的一半 + 該數
```

``` 1 × 6 = 05 +  1 =  6
2 × 6 = 10 +  2 = 12
3 × 6 = 15 +  3 = 18
4 × 6 = 20 +  4 = 24
5 × 6 = 25 +  5 = 30
6 × 6 = 30 +  6 = 36
7 × 6 = 35 +  7 = 42
8 × 6 = 40 +  8 = 48
9 × 6 = 45 +  9 = 54
10 × 6 = 50 + 10 = 60
```

``` 數 × 9 = 該數乘以10 - 該數
```
``` 1 × 9 = 10 -  1 =  9
2 × 9 = 20 -  2 = 18
3 × 9 = 30 -  3 = 27
4 × 9 = 40 -  4 = 36
5 × 9 = 50 -  5 = 45
6 × 9 = 60 -  6 = 54
7 × 9 = 70 -  7 = 63
8 × 9 = 80 -  8 = 72
9 × 9 = 90 -  9 = 81
10 × 9 = 100 - 10 = 90
```