Multiply 3-digit numbers in 10 seconds | multiplication trick | Short trick

In this video I have explained a trick to multiply 3-digit numbers in 10 seconds. These are 10 seconds short math tricks which are useful for any competitive exam.
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...  Shakuntala devi trick to calculate the cube of 2-digit number in 10 seconds | cube trick
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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