Square any number in 10 seconds | Shakuntala Devi's Square trick

In this video I have explained a trick by shakuntala devi to calculate a square of any number in 10 seconds.
Shakuntala Devi (1929 – 2013) was an Indian mathematician, writer and mental calculator. She was popularly known as the "human computer".
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My previous videos:
1) Cube trick:    • How to cube of 2 digit number in 10 second...  
2) Square trick:    • Square any number in 10 seconds | Shakunta...  
3) Square root trick:    • Square root of any number in 5 seconds | s...  
4) Cube root trick:    • Cube root of any number in 10 seconds | cu...  
5) Fifth root trick:    • 5th root in 5 seconds | fifth root trick|  

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