算术(英语:arithmetic)是数学最古老搭子最簡單个一個分支,基本上畀每個人用个,從日常生活当中簡單个算數到高深个科学搭子工商业計算都侪會畀用到。一般性来讲,算術箇个詞指是記錄數字某些運算基本性質个数学分支。常用个运算有加法、減法、乘法、除法,有辰光,更复杂个运算如指数搭平方根,阿包括来勒算术运算个范畴内。算术运算要按照特定规则来进行。
算术运算指加法、减法、乘法和除法,但有辰光也包括较高级个运算(例如百分比、平方根、取幂搭对数)。算术按运算次序进行,只要集合可以进行加减乘除四则运算(除以零除外),而四则运算合乎基本公理,侪可称为一个域(Field)。
加法表
| + | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1 |
2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 2 |
3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 3 |
4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 4 |
5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 5 |
6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 6 |
7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 7 |
8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 8 |
9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 9 |
10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 10 |
11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
|
乘法表
| × | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1 |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 2 |
2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
| 3 |
3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 | 27 | 30 |
| 4 |
4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | 40 |
| 5 |
5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
| 6 |
6 | 12 | 18 | 24 | 30 | 36 | 42 | 48 | 54 | 60 |
| 7 |
7 | 14 | 21 | 28 | 35 | 42 | 49 | 56 | 63 | 70 |
| 8 |
8 | 16 | 24 | 32 | 40 | 48 | 56 | 64 | 72 | 80 |
| 9 |
9 | 18 | 27 | 36 | 45 | 54 | 63 | 72 | 81 | 90 |
| 10 |
10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
|