How do you write 42 in Roman numerals?

42 is written as XLII in Roman numerals: 42 = 40 (XL) + 2 (II). The symbols are then written from largest to smallest value.

What does XLII stand for?

XLII stands for the number 42. Reading left to right: XL = 40, II = 2.

How do you write "42nd" in Roman numerals?

Ordinal numbers use the same numerals as cardinal numbers, so "42nd" is written XLII — Roman notation has no separate ordinal form.

42 in Roman Numerals

How to write the number 42 in Roman numerals, with the full place-value breakdown.

The number 42 in Roman numerals

XLII

Place-value breakdown

42 = 40 + 2, so XLII = XL + II. Roman numerals are written from largest to smallest value, left to right:

Place	Value	Roman	Rule
Tens	40	XL	Subtractive rule: XL = 50 − 10 (a smaller symbol before a larger one is subtracted)
Ones	2	II	Additive rule: II = 2 (symbols are simply added)

About the number 42

The number 42 is written XLII in Roman numerals.

Looking for the ordinal form — "42nd in Roman numerals"? Roman notation makes no distinction between cardinal and ordinal numbers, so "42nd" is also written XLII.

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