Mathematics
SumNinja
Quick, adaptive mental math rounds students can start with no account, no ads, and no setup.
- Grade bands
- K-2 · 3-5 · 6-8
- Price model
- Free
- Platforms
- Web
- Subject
- Mathematics
What it is
SumNinja runs short timed rounds of mental arithmetic that adjust to how a student is answering, with modes for speed, for accuracy, and for focused practice on a single times table or division facts. Strategy lessons cover moves like making ten, rounding, and doubling and halving. It runs in the browser and needs no student accounts, which makes it easy to bring into a lesson.
Notable features
- No student accounts
- Adaptive rounds
- Times table focus
A way to use it
Use a two minute round as a warm up, then ask students which strategy got them through the hardest question.
Privacy and accounts
No student accounts and no ads, according to the maker. Check its privacy page for how progress is stored.
A listing is a starting point, not a district approval. Check your own district's privacy and procurement rules before classroom use. Nobody pays to be listed here, and this link earns no commission.
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