About Number Ninja
Sharpen your maths, one problem at a time
- What it builds: Quick mental arithmetic, with problems that get harder only as answers get faster.
- Ages: 5 and up — part of the Explorer set.
- On a TV: the arrows move and OK chooses, so the remote is all it needs. A keyboard, mouse or touch screen works too.
- Free: no sign-up and no adverts. Nothing your child does here is uploaded.
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