Question

number of digits in the square of a two digit number is​

Answer 1

Minimum is 3 (10 x 10 = 100)

maximum is 4 (99 x 99 = 9801)

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Answer 2

trick to know about

number of digits in the square of a two digit number is

2 × first number

for example

number between 2^2 and 3^2

2× first number

2×2

4

hence number between 2^2 and 3^2 is 4.