Mathematics — Numeral Systems · Roman numeral converter and matching activity

Legion of Numbers

Convert between Hindu-Arabic numbers and Roman numerals by using place value and subtractive notation.

Landscape activity · use fullscreen on a phone for larger controls

↗ New Window

📝 Description

Legion of Numbers is an interactive mathematics game designed to make number practice more engaging. Students work with number-based challenges that support calculation, pattern recognition, reasoning, and confidence. It is suitable for classroom practice and self-learning.

📋 Instructions

Follow the in-game instructions, complete the number challenges, and take the quiz to check your understanding.

🎓 Learning Guide: Legion of Numbers

Learning focus: Convert between Hindu-Arabic numbers and Roman numerals by using place value and subtractive notation.

Mathematics — Numeral Systems Roman numeral converter and matching activity

Learning objectives

Recognise standard symbols I, V, X, L, C, D and M
Interpret combinations such as IV and IX
Check whether a proposed numeral follows standard notation for the chosen range

Concepts and principles

Roman numerals combine additive and, for certain pairs, subtractive notation.
IV represents 4 and IX represents 9; VII represents 7.
Roman numerals are not a positional base-ten system with a zero digit like standard decimal numerals.

Examples and worked solutions

Independent teaching example (not verified as an in-game prompt): Convert 49 into conventional Roman numerals.: Worked solution: 49=40+9; XL represents 40 and IX represents 9, giving XLIX.

Guided practice

Choose a supported number range in the activity
Write the expected Roman or decimal form before revealing/matching
Explain each subtraction pair in your answer

Expected observations and explanations

IV is standard for 4, not the nonstandard form IIII in typical educational notation.
Repetition and subtraction follow restrictions; not every symbol ordering is valid.