The numbers 1909 to 1915 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 1909 | = | MCMIX | = | 1000 + 1000 − 100 + 10 − 1 |
| 1910 | = | MCMX | = | 1000 + 1000 − 100 + 10 |
| 1911 | = | MCMXI | = | 1000 + 1000 − 100 + 10 + 1 |
| 1912 | = | MCMXII | = | 1000 + 1000 − 100 + 10 + 1 + 1 |
| 1913 | = | MCMXIII | = | 1000 + 1000 − 100 + 10 + 1 + 1 + 1 |
| 1914 | = | MCMXIV | = | 1000 + 1000 − 100 + 10 + 5 − 1 |
| 1915 | = | MCMXV | = | 1000 + 1000 − 100 + 10 + 5 |