The numbers 1975 to 1981 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 1975 | = | MCMLXXV | = | 1000 + 1000 − 100 + 50 + 10 + 10 + 5 |
| 1976 | = | MCMLXXVI | = | 1000 + 1000 − 100 + 50 + 10 + 10 + 5 + 1 |
| 1977 | = | MCMLXXVII | = | 1000 + 1000 − 100 + 50 + 10 + 10 + 5 + 1 + 1 |
| 1978 | = | MCMLXXVIII | = | 1000 + 1000 − 100 + 50 + 10 + 10 + 5 + 1 + 1 + 1 |
| 1979 | = | MCMLXXIX | = | 1000 + 1000 − 100 + 50 + 10 + 10 + 10 − 1 |
| 1980 | = | MCMLXXX | = | 1000 + 1000 − 100 + 50 + 10 + 10 + 10 |
| 1981 | = | MCMLXXXI | = | 1000 + 1000 − 100 + 50 + 10 + 10 + 10 + 1 |