Math practice · reimagined
Determinant
Turn Determinant 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
Determinant
Pick a fighter, choose Determinant, 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.
A 2×2 matrix is a little grid of four numbers, arranged in two rows: a b on top, c d below. Its determinant is a single number that measures the grid, and there's a tidy cross pattern to find it.
Multiply the main diagonal (top-left × bottom-right = a × d), then subtract the other diagonal (top-right × bottom-left = b × c). For [ 2 3 ; 1 4 ]: that's (2 × 4) − (3 × 1) = 8 − 3 = 5. The answer can come out negative — that's fine, use the − key.
Cross-multiply both diagonals, subtract, and type the determinant.
— Quick answers —
Determinant: the short FAQ
- Is Determinant free to play?
- Yes. Determinant 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 Determinant 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 Determinant?
- Nope. Determinant runs in any browser, on a laptop, tablet or phone.
- Can Determinant be used in the classroom?
- Absolutely. Teachers run Determinant with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.