There's an incredible method to extract the square root of a perfect square in your head.
MIT Entrace Exam Arithmetic 1876 WayBackMachine:
Square root method Burning Math
Square root method proof Math StackExchange
Square root method Grey Matters
Hindu-Arabic numeral system
Laplace quote
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Abacus picture
A similar method to extract the cube root of number in your head explained in this video:
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How To Calculate Square Roots - Numerals That Changed Math Forever For Country: United States. City: Detroit, Elk Grove, Rochester, Round Rock, Wichita Falls
