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News from Mathnasium of Southtowns

Mathnasium #MathTricks: Divisibility (Rule for 3s)

Oct 31, 2021

 

A number is divisible by 3 if the sum of the digits is divisible by 3.

To determine if the number 87 is divisible by 3, we find the sum of its digits. Eight plus seven gives us a final sum of fifteen. Fifteen is divisible by 3. So,

87 is divisible by 3.

Click here for more practice problems!