490 in Roman Numerals
490
C (subtracted)DX (subtracted)C
four hundred ninety
How CDXC is formed
| Place | Value | Symbols |
|---|---|---|
| Hundreds | 400 | C (subtracted)D |
| Tens | 90 | X (subtracted)C |
| Total | 490 | CDXC |
CDXC is written one place at a time, from the largest to the smallest: CD (400) + XC (90) = 490.
CD and XC are subtractive pairs: in each one the smaller symbol comes first and is taken away.
Common mistakes
Wrong: XD
Why isn't 490 written as XD?
X can only be subtracted from L and C, so XD (500 − 10) is not a valid pair. Write each place separately: CD (400) + XC (90) = CDXC.
Wrong: CCCCXC
Why isn't 490 written as CCCCXC?
A symbol can't be repeated four times in a row. 400 is CD (500 − 100), not CCCC, so 490 is CDXC.
Wrong: CDLXXXX
Why isn't 490 written as CDLXXXX?
A symbol can't be repeated four times in a row. 90 is XC (100 − 10), not LXXXX, so 490 is CDXC.
Numbers near 490
Properties of 490
- Prime factors
- 2 × 5 × 7²
- Divisors
- 1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490
- Even or odd
- Even
- Prime number
- No
- Letters in CDXC
- 4
490,000 in Roman numerals
With a bar over it (vinculum), C̅D̅X̅C̅ means 490 × 1,000 = 490,000. How Roman numerals work