Number
987 in Roman numerals
987 is written CMLXXXVII
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 CMLXXXVII 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.
- LXXXtens · 8L (50) plus XXX (30) makes 80.
- VIIones · 7V (5) plus II (2) makes 7.
900 + 80 + 7 = 987
The pair CM uses 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 DCCCCLXXXVII (12 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CMLXXXVII (9 letters) is the standard.
About the number 987
- 987 is odd and can be split into prime factors: 3 × 7 × 47, or in Roman numerals III × VII × XLVII.
- CMLXXXVII has 9 letters. 31 of the numbers up to 1,000 have longer numerals.
Counting from 981 to 990
Every number from 981 to 990 starts CM (900); only the ending changes.
| Number | Roman numeral |
|---|---|
| 981 | CMLXXXI |
| 982 | CMLXXXII |
| 983 | CMLXXXIII |
| 984 | CMLXXXIV |
| 985 | CMLXXXV |
| 986 | CMLXXXVI |
| 987 | CMLXXXVII |
| 988 | CMLXXXVIII |
| 989 | CMLXXXIX |
| 990 | CMXC |