Elementary Brain Teaser

Fun and accessible problems for younger students or beginners. Posted every Monday, these weekly brain teasers kickstart your week with a mental warm-up.

Two or Three

Posted: March 17, 2025

71 % of users got this correct

The counting numbers 2, 4, 6, 8 and 10 are divisible by 2. The numbers 3, 6, and 9 are divisible by 3. Therefore, there are 7 numbers from 1 to 10 (including 1 and 10) that are divisible by two or three (2, 3, 4, 6, 8, 9, 10). How many counting numbers from 1 to 100 (including 1 and 100) are divisible by 2 or 3?

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