Drop a 1 to Make a Prime

Random Science or Numbers Quiz

Can you pick the numbers which will become prime if a 1 is removed?

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How to Play
Each number in the quiz contains one or more 1s. Click on the numbers that will become prime numbers if a 1 is removed. Example: Removing the '1' in '31' leaves '3', so this would count. On the other hand, removing the '1' from '216' leaves '26', which is not prime, so this would not count. (N.B.: for numbers with more than one '1', remove just one of them.)
Score 0/20 Timer 03:00
Guesses Remaining 20 Correct 0 Wrong 0

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Created Jan 8, 2014Curator's PickReportNominate
Tags:Clickable, math, Numbers, mathematics, prime, Prime Numbers