How to Square Numbers Mentally the Easy MisterNumbers Pattern Play Math Way

https://www.patternplaymath.com/ MisterNumbers Pattern Play Math shares an easy way to square numbers mentally, mostly using addition or subtraction, and only simple multiplication. This is part of a revolutionary fun approach to math that plays with the ones and tens digits separately for magical results.
For background videos to understand this one: see this video
   • How to square numbers to 40 the easy way  
And this one shows how to easily square numbers ending in 5:
   • How to Square Numbers ending in 5 eas...  

The steps to mentally squaring any number up to 100 are:
1) Square a nearby number ending in 5 or 0 and keep the tens digits (drop the last 0). Easy way to square a number ending in 5 is    • How to Square Numbers ending in 5 eas...  . (Every number is within two of a 0 or 5, but numbers ending in 3 and 7 can also be found from zero.) Example 22: use 20 squared is 400: tens are 40.
2) Take 1/5 of that number you squared and add or subtract that to the tens digits, as many times as you are going up or down. THAT is your tens-digit of your answer. 22 example is 48 (40 +4 + 4).
3) Square the ones-digit number. Use the ones-digit of the answer (no carrying needed!). Example 22: 2 x 2 = 4. Answer 48 4. or 484.
https://www.patternplaymath.com/
You can use this system for numbers 1-100 or higher.
You can also use it to find square roots and more.
Share this with students and like this video if you find it amazing and magical.
I will be adding text and video links to this, and willing to help out and answer any questions. This system works easily, so please ask any questions to make it clearer for you and others.