Question

state the possible number of d

igit in the following square number is (a) 72 square

Answer 1

72^2=5184 no.of digits are 4

Answer 2

GIVEN :

The number 72.

TO FIND :

Number of digits in 72^2

SOLUTION :

◆Analysing digit 72,

Since 72 is much greater than 30 , which is maximum number on squaring gives 30×30 =900, a 3digit number.

◆(Even though 31^2 = 961 , we take roundoff number as 30 , for better understanding)

◆As 72 is less than 100 , which is the minimum number on squaring gives 100^2 = 10,000 , a five digit number.

◆Squaring 72 will obviously lead to a 4 digit number.

◆72×72 = 5184. A 4 digit number.

ANSWER. :

72^2 = 5184. A 4 digit number.