Math practice · reimagined
Roman numerals
Turn Roman numerals into a fight you actually want to win. Every problem is an attack — solve it faster than your opponent and you land the hit.
Ages 4–99+ · no download · plays in your browser · 23 languages
How it works
Roman numerals
Pick a fighter, choose Roman numerals, and trust your numbers. The faster and cleaner you solve, the harder you hit — from gentle early grades all the way to Olympic-level challenges.
Romans wrote numbers with letters. Each letter is worth a fixed amount, and you mostly just add them up left to right.
XII is X(10) + I(1) + I(1) = 12. The one twist: when a smaller letter sits BEFORE a bigger one, you subtract it — IV is 5 − 1 = 4, and IX is 10 − 1 = 9.
Read the letters, add them up, and type the everyday number.
Every level of Roman numerals
- T1Read smallGrade 3 · 8 yrsRoman numeral → number, up to XXXIX.Play free ▸
- T2Read bigGrade 4 · 9 yrsRoman numeral → number, into the thousands.Play free ▸
- T3Spot the valueGrade 3 · 8 yrsPick the number a Roman numeral equals.Play free ▸
- T4Write itGrade 4 · 9 yrsTurn a number into its Roman numeral.Play free ▸
- T5Add themGrade 5 · 10 yrsAdd two Roman numerals, answer in Roman.Play free ▸
- T6Take awayGrade 5 · 10 yrsSubtract two Roman numerals, answer in Roman.Play free ▸
More math to master
— Quick answers —
Roman numerals: the short FAQ
- Is Roman numerals free to play?
- Yes. Roman numerals is free to play right in your browser — the whole curriculum, no download, no signup. Paid plans later unlock the full fighter roster, every stage and saved progress.
- Who is Roman numerals for?
- Anyone from 4 to 99+. The early grades stay gentle for beginners, while the higher tiers will make even the confident sweat.
- Do I need to download anything to play Roman numerals?
- Nope. Roman numerals runs in any browser, on a laptop, tablet or phone.
- Can Roman numerals be used in the classroom?
- Absolutely. Teachers run Roman numerals with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.