Divisibility Detective

How to play

1. Read the divisibility rules prompt and identify the mathematical relationship being tested.
2. Enter or choose an answer, then use the immediate feedback to check your method.
3. Complete ten rounds and replay with a new generated set when you want more practice.

What this game practices

This game isolates divisibility rules in short generated rounds. It can support practice and discussion, but a score mainly reflects performance on this interface and should not be treated as a complete measure of mathematical understanding.

How we checked it

First-party browser game tested in the local coolmath build for question generation, answer checking, restart behavior, keyboard and touch input, narrow-screen fit, console errors, and failed network requests. Problems are generated locally and no answer, score, or game action is sent to a third party.

Reviewed by coolmath Editorial Team · Updated 2026-10-09