The numbers 1638 to 1644 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 1638 | = | MDCXXXVIII | = | 1000 + 500 + 100 + 10 + 10 + 10 + 5 + 1 + 1 + 1 |
| 1639 | = | MDCXXXIX | = | 1000 + 500 + 100 + 10 + 10 + 10 + 10 − 1 |
| 1640 | = | MDCXL | = | 1000 + 500 + 100 + 50 − 10 |
| 1641 | = | MDCXLI | = | 1000 + 500 + 100 + 50 − 10 + 1 |
| 1642 | = | MDCXLII | = | 1000 + 500 + 100 + 50 − 10 + 1 + 1 |
| 1643 | = | MDCXLIII | = | 1000 + 500 + 100 + 50 − 10 + 1 + 1 + 1 |
| 1644 | = | MDCXLIV | = | 1000 + 500 + 100 + 50 − 10 + 5 − 1 |