11+ maths using Roman numerals practice
21 October 2026
Understanding Roman numerals
Roman numerals often appear in 11+ maths questions. Children may be asked to read, write or calculate using these ancient symbols. Practising them helps build number sense and prevents avoidable mistakes.
How Roman numerals work
Roman numerals use seven letters: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are formed by combining these letters. If a smaller value comes before a larger one, you subtract. Otherwise, you add.
Key insight: Most errors with Roman numerals come from misreading the order or missing the subtract rule. Encourage your child to check each numeral carefully, especially when a smaller letter comes before a bigger one.
Worked example
Convert the Roman numeral XXIV to an Arabic number, then add VI, and convert the result back to Roman numerals.
Step 1: XXIV is 10 + 10 + 4 = 24.
Step 2: VI is 5 + 1 = 6.
Step 3: Add 24 + 6 = 30.
Step 4: 30 in Roman numerals is XXX.
The answer is XXX.
Supporting your child
Start with simple conversions both ways. Ask your child to explain their thinking out loud. This helps spot misunderstandings early and builds confidence for the 11+ exam.
