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HOW CAN WE FIND OUT SQUARE OF A NUMBER EASILY

lets take 13
to find the square of 13
calculate the square of second digit 3
sq(3)= 9 ------[A]
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then multiply the 1st digit, second digit and 2(representing square)
1 * 3 * 2 = 6--------[B]
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then calculate the square of 1st digit 1
sq(1)=1--------[C]
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write down the results in this order [C][B][A] i.e 1 6 9


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