Roman
To refer to numbers in Latin taken a combination of seven characters: I (1), V (5), X (10), L (50), C (100), D (500), M (1000).
If you sign a smaller number, it is right on the mark, signifying a greater number, the smaller number should be put in more, if - on the left, then subtract.
If you sign a smaller number, it is right on the mark, signifying a greater number, the smaller number should be put in more, if - on the left, then subtract.
| VI | - 6, ie, 5 +1 |
| IV | - 4, ie 5-1 |
| XI | - 11, ie, 10 +1 |
| IX | - 9, ie, 10-1 |
| LX | - 60, ie 50 +10 |
| XL | - 40, ie 50-10 |
| CX | - 110, ie 100 +10 |
| XC | - 90, ie, 100-10 |
| XXX | - 300, ie 100 +100 +100 |
| MDCCCXII | - 1812, ie 1000 +500 +100 +100 +100 +10 +1 +1 |
| MCMXVII | - 1917, ie 1000 +1000-100 +10 +5 +1 +1 |