How to play Prime Finder
- Tap each number you think is prime.
- Press Check to see if you found them all.
Prime Finder
Hunt down every prime in the grid, and don't get fooled by numbers like 21 and 33.
What it helps you learn
- Practises divisibility rules for 2, 3, 5 and 7.
- Builds familiarity with primes under 50.