在『阿拉伯』數字傳入歐洲時,其數字為古『羅馬』數字. 今用於鐘錶日曆,但『羅馬』數字冇『0』
『羅馬』數字四規
- 倍數重複
- 三倍限制
- 右加左減
- 加綫乘千
『羅馬』數字 | 記數規則 | 解話 |
Ⅰ | 1 | 表示1 |
Ⅱ | 1+1=2 | 兩個Ⅰ |
Ⅲ | 1+1+1=3 | 三個Ⅰ |
Ⅳ | -1+5=4 | Ⅴ左則Ⅰ |
Ⅴ | 5 | Ⅴ表示5 |
Ⅵ | 5+1=6 | Ⅴ右則Ⅰ |
Ⅶ | 5+1+1=7 | Ⅴ右則兩個Ⅰ |
Ⅷ | 5+1+1+1=8 | Ⅴ右則三個Ⅰ |
Ⅸ | -1+10=12 | Ⅹ左則Ⅰ |
Ⅹ | 10 | Ⅹ表示10 |
Ⅺ | 10+1=11 | Ⅹ右則Ⅰ |
Ⅻ | 10+1+1=12 | Ⅹ右則兩個Ⅰ |
『阿拉伯』數字 | 『古羅馬』數字 | WORD便捷鍵 |
1 | Ⅰ | ALT+8544 |
2 | Ⅱ | ALT+8545 |
3 | Ⅲ | ALT+8546 |
4 | Ⅳ | ALT+8547 |
5 | Ⅴ | ALT+8548 |
6 | Ⅵ | ALT+8549 |
7 | Ⅶ | ALT+8550 |
8 | Ⅷ | ALT+8551 |
9 | Ⅸ | ALT+8552 |
10 | Ⅹ | ALT+8553 |
11 | Ⅺ | ALT+8554 |
12 | Ⅻ | ALT+8555 |
13 | XIII | |
14 | XIV | |
15 | XV | |
16 | XVI | |
17 | XVII | |
18 | XVIII | |
19 | XIX | |
20 | XX | |
21 | XXI | |
30 | XXX | |
40 | XL | |
50 | L | ALT+8556 |
60 | LX | |
70 | LXX | |
80 | LXXX | |
90 | XC | |
100 | C | ALT+8557 |
200 | CC | |
300 | CCC | |
400 | CD | |
500 | D | ALT+8558 |
600 | DC | |
700 | DCC | |
800 | DCCC | |
900 | CM/DCCCC | |
1,000 | M | ALT+8559 |
2,000 | MM | |
3,000 | MMM | |
4,000 | MV | |
5,000 | V | |
10,000 | X | |
50,000 | L | |
100,000 | C | |
500,000 | D | |
1,000,000 | M |