Puzzler Grades 9-12
ShillerMath Brain Boosters challenge the mind and inspire creative math thinking. See if your student can develop the proof or come up the answer.

By Antoinette LaGrossa

Why is it true that a number whose digits sum to a multiple of 3 will also be divisible by 3 (and vice versa)?

We'd love to see your student's answer! Post it on the ShillerMath Facebook Page or tweet @ShillerMath. No peeking - we'll update the blog with the answer next week.

I hope you enjoyed this short math break.

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• Open'N'Go: No lesson preparation
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Is your child having trouble with math?