Видео с ютуба How To Do Math In Your Head

Math Heads: DO MATH IN YOUR HEAD! - Math Bites with Danica McKellar

How to Calculate Faster than a Calculator - Mental Math #1

How I learned to Calculate Extremely Fast

Mental Addition and Subtraction Tips — Math Tricks with Arthur Benjamin

Mental Math Tricks - Addition and Subtraction in your head!

How to Actually Get Better at Math

Why do people get so anxious about math? - Orly Rubinsten

How to Calculate Faster than a Calculator - Mental Maths #1

Can You Do Math In Your Head?!?

Stop Trying to Understand Math, Do THIS Instead

Becoming good at math is easy, actually

Anyone Can Be a Math Person Once They Know the Best Learning Techniques | Po-Shen Loh | Big Think

How to Do Math In Your Head : Quick Math Tricks With Fast Multiplication Techniques