Talen 3915 till 3921 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 3915 | = | MMMCMXV | = | 1000 + 1000 + 1000 + 1000 − 100 + 10 + 5 |
| 3916 | = | MMMCMXVI | = | 1000 + 1000 + 1000 + 1000 − 100 + 10 + 5 + 1 |
| 3917 | = | MMMCMXVII | = | 1000 + 1000 + 1000 + 1000 − 100 + 10 + 5 + 1 + 1 |
| 3918 | = | MMMCMXVIII | = | 1000 + 1000 + 1000 + 1000 − 100 + 10 + 5 + 1 + 1 + 1 |
| 3919 | = | MMMCMXIX | = | 1000 + 1000 + 1000 + 1000 − 100 + 10 + 10 − 1 |
| 3920 | = | MMMCMXX | = | 1000 + 1000 + 1000 + 1000 − 100 + 10 + 10 |
| 3921 | = | MMMCMXXI | = | 1000 + 1000 + 1000 + 1000 − 100 + 10 + 10 + 1 |