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2xKit

Prime Number Sprint

Decide fast — is this number prime or not?

Runs in your browser

How to use this

  1. 1Click "Start" to begin the Prime Number Sprint timer.
  2. 2Read each prompt, then decide whether the number shown is prime from the options shown.
  3. 3Answer as many as you can before time runs out — a correct pick loads the next question instantly.
  4. 4When the timer ends, your score is saved as your personal best if it's a new high.

Frequently asked questions

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