What single digit appears most frequently when you write out all the whole numbers from 1 to 100 inclusive?
1
The digit 1 appears in the units place 10 times, the tens place 10 times, and once in the number 100, totaling 21 times, which is more than any other digit.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Hard. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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