OUTSIDE THE BOX:
Prime numbers are divisible only by themselves and 1. This free online game designed by a British mathematician helps sharpen your mental math skills by seeing how many prime numbers you can correctly identify in 60 seconds -- but that means clicking "no" on all those tricky non-primes like 87 (which might look prime but is 3x29) that also pop up. isthisprime.com/game/
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