420 in Roman numerals

The number 420 is written in Roman numerals like this: CDXX

CDXX = 420

How to write 420 in Roman numerals

Split the number by place value and write each part in Roman numerals:

• 400 = CD (500 − 100)
• 20 = XX

Put the parts together: CD + XX = CDXX.

When a smaller symbol comes before a larger one, it is subtracted.

Going the other way? See the Roman numeral CDXX.

Previous number

419 in Roman numerals: CDXIX

Next number

421 in Roman numerals: CDXXI

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