CLASS 4 MATHS · NUMBERS

Roman numerals (I to XXXIX)

I = 1, V = 5, X = 10. A smaller symbol before a bigger one is subtracted (IV = 4, IX = 9); after it, added (VI = 6).

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Worked examples

Example 1 · level 1

What number does the Roman numeral II stand for?

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II = I (1) + I (1) = 2.

Answer: 2

Example 2 · level 2

What number does the Roman numeral XVIII stand for?

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XVIII = X (10) + V (5) + I (1) + I (1) + I (1) = 18.

Answer: 18

Example 3 · level 3

Write 20 in Roman numerals.

XXI
XXX
XX
XIX

Show solution

20 = X (10) + X (10) → XX.

Answer: XX