Видео с ютуба Tecmath

Easy Multiplication Trick you will Actually Use

How to work out percentages INSTANTLY

5 Fast Math Tricks for Multiplication - Mental Math

Math puzzle# ||Tecmath Learning||

Algebra Introduction - the basics

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How to Calculate ANY Fraction Easily!

Math trick# ||Tecmath Learning||

How to work the percentage of any amount instantly

Fast Mental Multiplication Trick - Multiply in your head using base 20 and 30