RD Sharma Class 8 Solutions Chapter 3 - Square and Square Roots (Ex 3.7) Exercise 3.7 - Free PDF
FAQs on RD Sharma Class 8 Solutions Chapter 3 - Square and Square Roots (Ex 3.7) Exercise 3.7
1. Which numbers cannot help to find whether they are square by looking at the digit of the unit place?
Natural numbers ending in 0,1,4,5,6 or 9 can be or cannot be a square number. Some examples are given here where you cannot find whether they are square or not by looking at the digit of the unit place.
3061: The digit at the unit place is 1 so it may or may not be a square number.
1059: The digit at the unit place is 9, so it may or may not be a square number.
1134: The digit at the unit place is 4, so it may or may not be a square number.
55370: The digit at the unit place is 0, so it may or may not be a square number.
77555: The digit at the unit place is 5 so it may or may not be a square number.
2. Which numbers are squares of even numbers?
123, 256, 1296, 5477.
The numbers 256, 1296, are squares of even numbers because we know that only even numbers can be the squares of even numbers and 256 and 1296 are even numbers.