Видео ютуба по тегу Mathematic Trick

Multiply Numbers in 1 Second – Faster Than a Calculator! (Mental Maths Trick)
Multiply Numbers in 1 Second – Faster Than a Calculator! (Mental Maths Trick)
Square any 2 digit number in 3 seconds I Crazy Math Trick
Square any 2 digit number in 3 seconds I Crazy Math Trick
99% of people don't know this secret math trick
99% of people don't know this secret math trick