800 in Roman numerals

800 in Roman numerals is DCCC.

Pick any whole number from 1 to 3,999.

800 = \text{DCCC}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 500 (D) + 100 (C) + 100 (C) + 100 (C) = 800.
3
Joined together: DCCC. (Four of the same letter in a row is never used: 4 is IV, 9 is IX, 40 is XL, 90 is XC, 400 is CD, 900 is CM.)

What is 800 in Roman numerals?

DCCC.

How do you read DCCC?

DCCC = 500 + 100 + 100 + 100 = 800.