#### How Do We Measure Rainfall? A Fun DIY Guide

Discover how we measure rainfall, why it is important, what units and math we use for measuring, and how you can set up your own rain gauge at home.

Nov 10, 2021

To test if a number is **divisible by 11,** follow the general rule: *the difference of the sum of alternating digits can be divided by 11.*

To determine if the number 2,728 is divisible by 11, find the difference of the sum of alternating digits. The first sum of the alternating digits is four. The second sum of the alternating digits is fifteen. The difference between the two sums is eleven. Eleven is divisible by eleven, so

**2,728 is divisible by 11**.

Click here for more practice problems!

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

- 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 Center