Roman numerals
Practise converting ordinary numbers to Roman numerals and reading Roman numerals back to ordinary numbers.
How to solve this
- Roman numerals are built from symbols: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000.
- When a smaller symbol comes before a larger one, subtract it: IV is 4 and IX is 9.
- Convert in place-value chunks: 99 is 90 + 9, so it becomes XC + IX = XCIX.
Examples
14 as a Roman numeral
XIV
XL as an ordinary number
40
99 as a Roman numeral
XCIX