Question

how many digits are there in the square of the following numbers? 12, 32, 80 ,125, 425, 7258 with fully solved ?​

Answer 1

Number of digits in the square of n digit number is 2n-1
No. of digits in the square of 12 is 2 x 2 - 1 = 3
No. of digits in the square of 32 is 2 x 2 - 1 = 3
No. of digits in the square of 80 is 2 x 2 - 1 = 3
No. of digits in the square of 125 is 2 x 3 - 1 = 5
No. of digits in the square of 425 is 2 x 3 - 1 = 5
No. of digits in the square of 7258 is 2 x 4 - 1 = 7
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