The numbers 1921 to 1927 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 1921 | = | MCMXXI | = | 1000 + 1000 − 100 + 10 + 10 + 1 |
| 1922 | = | MCMXXII | = | 1000 + 1000 − 100 + 10 + 10 + 1 + 1 |
| 1923 | = | MCMXXIII | = | 1000 + 1000 − 100 + 10 + 10 + 1 + 1 + 1 |
| 1924 | = | MCMXXIV | = | 1000 + 1000 − 100 + 10 + 10 + 5 − 1 |
| 1925 | = | MCMXXV | = | 1000 + 1000 − 100 + 10 + 10 + 5 |
| 1926 | = | MCMXXVI | = | 1000 + 1000 − 100 + 10 + 10 + 5 + 1 |
| 1927 | = | MCMXXVII | = | 1000 + 1000 − 100 + 10 + 10 + 5 + 1 + 1 |