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Mental Math for Squaring Numbers

The following videos show some math tricks that will help you to do mental math for squaring numbers quickly and efficiently.

Math Tricks: Squaring Numbers Ending in 5
In this video we look at an easy way to square numbers that end in 5. This will work for any number, great or small and is one of the fastest tricks you'll learn.

To find the square of a two-digit number ending with 5,
take the first digit, multiply by itself plus one, and then put "25" after it.
Example: To find 55², compute 5 × 6 = 30. The answer is 3025

This will also work with larger numbers
Example: To find 115², compute 11 x 12 = 132. The answer is 13225

Worksheets to help you practice Squaring Numbers Ending in 5

How to Square a Number in the 50's
Another Math trick, followed by an explanation of why it works.
Squaring a number in the 50's or near to 50 can be done easily in your head in seconds.

Fun Math Trick! Squaring Numbers Near 100
A neat way to square numbers near 100 without having to multiply it out the long way

How to Square Anything
Let's look at formulas a different way. Hey, we can learn how to square anything almost instantly.

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