Number
979 in Roman numerals
979 is written CMLXXIX
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How CMLXXIX is built
Roman numerals are written one decimal place at a time, largest first.
- CMhundreds · 9C before M means 1,000 − 100 = 900. This saves writing DCCCC.
- LXXtens · 7L (50) plus XX (20) makes 70.
- IXones · 9I before X means 10 − 1 = 9. This saves writing VIIII.
900 + 70 + 9 = 979
The pairs CM and IX use subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not DCCCCLXXVIIII (13 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CMLXXIX (7 letters) is the standard.
About the number 979
- 979 is odd and can be split into prime factors: 11 × 89, or in Roman numerals XI × LXXXIX.
- CMLXXIX has 7 letters. 216 of the numbers up to 1,000 have longer numerals.
Counting from 971 to 980
Every number from 971 to 980 starts CMLXX (970); only the ending changes.
| Number | Roman numeral |
|---|---|
| 971 | CMLXXI |
| 972 | CMLXXII |
| 973 | CMLXXIII |
| 974 | CMLXXIV |
| 975 | CMLXXV |
| 976 | CMLXXVI |
| 977 | CMLXXVII |
| 978 | CMLXXVIII |
| 979 | CMLXXIX |
| 980 | CMLXXX |