Smartly Squaring a 2-Digit Number Ending on 1

Here's a GREAT and LIGHTENING FAST trick to square any 2-digit number ending on 1. Enjoy.
Smartly Squaring a 2-Digit Number Ending on 1
Smartly Squaring a 2-Digit Number Ending on 1
Smartly Squaring a 2-Digit Number Ending on 1

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