The Romans developed a system of writing numbers. The biggest difference between the Roman number system and the system we use today, the Arabic system, is the Romans did not use zeros.
| 1 | I | 500 | D |
| 2 | II | 1000 | M |
| 3 | III | 5000 | V |
| 4 | IV | ||
| 5 | V | ||
| 6 | VI | ||
| 7 | VII | ||
| 8 | VIII | ||
| 9 | IX | ||
| 10 | X | ||
| 20 | XX | ||
| 30 | XXX | ||
| 40 | XL | ||
| 50 | L | ||
| 60 | LX | ||
| 70 | LXX | ||
| 80 | LXXX | ||
| 90 | XC | ||
| 100 | C |
