1979 in Roman numerals at a glance
- Roman numeral
- MCMLXXIX
- Lowercase
- mcmlxxix
- Letters
- 8
- Parts
- M · CM · L · X · X · IX
- Subtractive pairs
- CM, IX
- Read aloud
- nineteen seventy-nine
- Leap year?
- No
How MCMLXXIX is built
Roman numerals are written one decimal place at a time, from the largest place to the smallest. Converting each digit of 1979 separately and joining the pieces gives MCMLXXIX:
| Place | Digit | Value | Numeral |
|---|---|---|---|
| Thousands | 1 | 1,000 | M |
| Hundreds | 9 | 900 | CM |
| Tens | 7 | 70 | LXX |
| Ones | 9 | 9 | IX |
Reading it back, left to right:
- M = 1,000 → running total 1,000
- CM = 900 (M minus C) → running total 1,900
- L = 50 → running total 1,950
- X = 10 → running total 1,960
- X = 10 → running total 1,970
- IX = 9 (X minus I) → running total 1,979
Why MCMLXXIX has 8 letters
Every year from 1900 to 1999 begins with MCM (1,900); the rest of MCMLXXIX after MCM — LXXIX — spells out 79. Of the 201 years from 1900 to 2100, 22 have a longer numeral and 147 a shorter one.
The rules MCMLXXIX follows
- Largest to smallest. MCMLXXIX uses the symbols M, C, L, X and I (8 characters in all), and the values never increase from left to right except inside a subtractive pair.
- Subtraction. CM (900) and IX (9) are subtractive pairs: a smaller symbol in front of a larger one is taken away from it. Only six pairs are allowed — IV, IX, XL, XC, CD and CM — and MCMLXXIX uses two of them.
- Repetition. XX repeats X two times. I, X, C and M may repeat up to three times in a row; V, L and D never repeat.
Common mistakes when writing 1979
- MDCCCCLXXIX — wrong because standard numerals never repeat a symbol four times; 900 is written CM. The correct form is MCMLXXIX.
- MCMLXXVIIII — wrong because standard numerals never repeat a symbol four times; 9 is written IX. The correct form is MCMLXXIX.
The year 1979 in Roman numerals: where it appears
- Film and TV credits. Copyright lines at the end of films and TV programs of the period commonly gave the year in numerals — a 1979 production might end with “Copyright MCMLXXIX.”
- Championship numbering. The pro football championship played in early 1979 was game XIII (13), since the series began with game I in January 1967.
- On a calendar. 1979 was not a leap year (365 days), and January 1 fell on a Monday. A full date such as July 4, 1979 is often written VII · IV · MCMLXXIX.
To turn a complete birth date or wedding date into numerals — with dots, dashes or spaces in US or day-first order — use the Roman numeral date converter.
Years around 1979 in Roman numerals
| Year | Roman numeral | Letters |
|---|---|---|
| 1974 | MCMLXXIV | 8 |
| 1975 | MCMLXXV | 7 |
| 1976 | MCMLXXVI | 8 |
| 1977 | MCMLXXVII | 9 |
| 1978 | MCMLXXVIII | 10 |
| 1979 | MCMLXXIX | 8 |
| 1980 | MCMLXXX | 7 |
| 1981 | MCMLXXXI | 8 |
| 1982 | MCMLXXXII | 9 |
| 1983 | MCMLXXXIII | 10 |
| 1984 | MCMLXXXIV | 9 |
Frequently asked questions
How do you write 1979 in Roman numerals?
1979 is written MCMLXXIX. Break it into M (1000), CM (900), L (50), X (10), X (10), IX (9) and add the parts: 1000 + 900 + 50 + 10 + 10 + 9 = 1979.
Is MDCCCCLXXIX a correct way to write 1979?
No. MDCCCCLXXIX is wrong because standard numerals never repeat a symbol four times; 900 is written CM. The standard numeral for 1979 is MCMLXXIX.
How do you say MCMLXXIX?
Read the value, not the letters: MCMLXXIX is the year 1979, said “nineteen seventy-nine.” Spelling out the letters one by one is only useful when checking a carving or engraving.
What year comes after MCMLXXIX?
1980, written MCMLXXX. The year before, 1978, is MCMLXXVIII.