845 in Roman numerals

845 in Roman numerals is DCCCXLV.

Pick any whole number from 1 to 3,999.

845 = \text{DCCCXLV}

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) + 40 (XL) + 5 (V) = 845.
3
Joined together: DCCCXLV. (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 845 in Roman numerals?

DCCCXLV.

How do you read DCCCXLV?

DCCCXLV = 500 + 100 + 100 + 100 + 40 + 5 = 845.