Number
790 in Roman numerals
790 is written DCCXC
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 DCCXC is built
Roman numerals are written one decimal place at a time, largest first.
- DCChundreds · 7D (500) plus CC (200) makes 700.
- XCtens · 9X before C means 100 − 10 = 90. This saves writing LXXXX.
700 + 90 = 790
The pair XC 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 DCCLXXXX (8 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today DCCXC (5 letters) is the standard.
- There's no letter for zero. The zero is simply left out, which is why 790 has 2 parts, not 3.
About the number 790
- 790 is even and can be split into prime factors: 2 × 5 × 79, or in Roman numerals II × V × LXXIX.
- DCCXC has 5 letters. 604 of the numbers up to 1,000 have longer numerals.
Counting from 781 to 790
Every number from 781 to 790 starts DCC (700); only the ending changes.
| Number | Roman numeral |
|---|---|
| 781 | DCCLXXXI |
| 782 | DCCLXXXII |
| 783 | DCCLXXXIII |
| 784 | DCCLXXXIV |
| 785 | DCCLXXXV |
| 786 | DCCLXXXVI |
| 787 | DCCLXXXVII |
| 788 | DCCLXXXVIII |
| 789 | DCCLXXXIX |
| 790 | DCCXC |