There’s an incredible method to calculate the square root of a perfect square in your head.
MIT Entrace Exam Arithmetic 1876 WayBackMachine:
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Square root method Burning Math
Square root method proof Math StackExchange
Square root method Grey Matters
#rtsqr
Hindu-Arabic numeral system
–Arabic_numeral_system
Laplace quote
–Arabic_numeral_system#Impact_on_arithmetic
Laplace picture
:Laplace,_Pierre-Simon,
Abacus picture
#/media/File:
A similar method to extract the cube root of number in your head explained in this video:
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