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Indian-Style Squaring (Numbers Ending in 5)

TOP/Collection of Applied Calculation Problems/Indian-style calculation method
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You can easily calculate the square of a number ending in 5. Train your brain with Indian-style mental arithmetic.
Problem:
to the power of 2Enter the number where the last 1 digit is 5.
Answer 
This method also applies when the units digits are not 5, provided that the two units digits add up to 10 and the tens digits are the same.
Example: 73×77＝5621

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