Keep Prime Numbers

About Keep Prime Numbers

Keep Prime Numbers is a puzzle about prime numbers. Remove blocks so that composite numbers fall away while prime numbers stay.

It's a clever way to practise recognising primes.

How to Play Keep Prime Numbers

1. Identify prime and composite numbers.
2. Click blocks to drop the composites.
3. Keep the primes safe.

Keep Prime Numbers Tips & Tricks

• Primes have exactly two factors.
• 2 is the only even prime.
• 1 is not prime.

Keep Prime Numbers FAQ

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