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Divisible by 3?


Everyone knows that a number with its units digit equal to 0, 2, 4, 6 or 8 is evenly divisible by two. Here’s a handy way to figure out if a number is divisible by 3. If the sum of the digits of the number in question is evenly divisible by 3 then that number also is divisible by 3.


Is 64,332 evenly divisible by 3?
Sum the digits of the number: 6 + 4 + 3 + 3 + 2 = 18
The answer is 18 which is evenly divisible by 3, so 64,332 is evenly divisible by 3.

A nice quick way to find out if 3 is a factor of a number or not!

posted under Math
2 Comments to

“Divisible by 3?”

  1. Avatar October 18th, 2011 at 9:14 pm Ella Brown Says:

    This example made it so easy to understand for my granddaughter!!

    Thanks guys!

    Love the website!!

  2. Avatar August 24th, 2014 at 1:19 pm Ron Fischman Says:

    Thanks, Ella! I’m really happy that our site helped. I’ve been writing on math and the brain in our blog, trying to bring the research down from the mountain. I hope you enjoy it, and that your granddaughters keep playing!

This is a blog about Math Nook, math games, math and other fun and educational subjects.
Math Nook is owned by Jan and Tommy Hall.

Jan is retired from education where she spent 30 years in various positions ranging from classroom teacher to math specialist. She now spends her time working on the website and raising MathPup.

Tommy works full time but spends his free time utilizing his math degree and love of games to create some of the math games found on the website.