Mathnasium #MathTricks: Divisibility (3-digit Rule for 11s)

Mathnasium #MathTricks: Divisibility (3-digit Rule for 11s)

Nov 3, 2021

One way to test if a three-digit number is divisible by 11 is to follow the 3-digit rule: the sum of the first and last digits equals the middle digit.

To determine if the number 792 is divisible by 11, we find the sum of seven and two. Seven plus two gives us a sum of nine, which is equal to the middle digit, nine. So,

792 is divisible by 11.

Click here for more practice problems!

SEE HOW MATHNASIUM WORKS FOR YOUR SITUATION

Answer a few questions to see how it works

My Child is:

Advanced in Math

Doing Ok, Could Do Better

Struggling with Math

OUR METHOD WORKS

Mathnasium meets your child where they are and helps them with the customized program they need, for any level of mathematics.

Elementary School

Find Their Path

HELP YOUR CHILD ACHIEVE THEIR FULL MATH POTENTIAL

We have over 1,000 centres. in North America. Get started now.

Find a location
Get a math skills assessment for your child
Your child will complete a customized learning plan

Get Started By Finding A Local Centre