42 in Roman numerals is XLII. Read from left to right: XL (40) + I (1) + I (1) = 42.
How to write 42 in Roman numerals
Break 42 into thousands, hundreds, tens and ones, then write each part with the largest symbols first:
- 40 (tens) = XL
- 2 (ones) = II
Join them: XLII.
XLII uses the subtraction rule in XL: a smaller symbol placed before a larger one is taken away from it, so XL = 40. Only I, X and C are used this way.
Roman numerals near 42
42 in words
42 is written forty-two in words (see 42 in words), and बयालीस in Hindi. Its ordinal form is 42nd, written forty-second.
Where you see Roman numerals
Roman numerals still appear on clock faces, in chapter and class numbers, in the names of kings and events, and in exam question numbering. For the full list of symbols and rules, see Roman numerals and the 1 to 100 chart.
Questions people ask
What is 42 in Roman numerals?
42 in Roman numerals is XLII.
What number is XLII?
XLII is 42: 40 + 1 + 1 = 42.
How do you write 42 in Roman numbers?
Write each place value with its symbols and join them: XL I I gives XLII.
What is 420 in Roman numerals?
420 is CDXX.