Setting up the board…
Take your time — nothing here can go wrong, and you can always try again.
Ready?
Prime Numbers
Take your time — nothing here can go wrong, and you can always try again.
Full screen — no distractions
Frequently Asked Questions
- What is "Prime Numbers" and how do you play it?
- Prime Numbers is a free, interactive mathematics game designed for 5th Grade students. Sort two-digit numbers into primes and composites. It supports 1-2 player(s), takes about 15 min, and is rated medium difficulty.
- Is this game free to play?
- Yes — Prime Numbers is 100% free with no signup required. Just open the page and start playing instantly in your browser on any device.
- What age or grade level is this game for?
- This game is designed for 5th Grade students. The mathematics content is curriculum-aligned for 5th grade level, making it a great supplement to classroom learning.
- Can my child play this game on a tablet or phone?
- Yes. All LittleActivity games work on any device — desktop, tablet, or phone. No app download needed; games run directly in the browser.
- What mathematics skills does this game cover?
- Prime Numbers covers 5th grade mathematics skills through interactive gameplay. It builds problem-solving, critical thinking, and subject fluency in a fun, no-pressure environment.
More 5th Grade Mathematics Games
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Wire each number to the primes that multiply to make it.
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Number Patterns and Rules
Wire each number pattern to the rule that makes it.
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Algebraic Thinking
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Measuring Angles
Open angles to exact measures and estimates, from 20° to a straight 180°.
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Classifying Triangles
Build triangles by their angles and their sides.
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Classifying Quadrilaterals
Sort statements about quadrilaterals: always, sometimes, or never true?
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