Blog / Mathnasium #MathTricks: Divisibility (Rule for 3's)

Mathnasium #MathTricks: Divisibility (Rule for 3's)

Oct 29, 2021 | A+

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.

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Mathnasium #MathTricks: Divisibility (Rule for 3's)

SEE HOW MATHNASIUM WORKS FOR YOUR SITUATION

Advanced in Math

Doing Ok, Could Do Better

Struggling with Math

OUR METHOD WORKS

Early Learners

Elementary School

Middle School

High School

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