MATHS CLASS 8 CH - 6 SQUARE AND SQUARE ROOTS MENTAL MATHS

Ones digit of a square number can be

(SELECT ALL THE CORRECT OPTIONS)

• 0

• 1

• 2

• 4

• 9

A number multiplied by itself is called a ________ of that number.

Sum of first n _______ numbers is n²

The difference of squares of 2 consecutive numbers can be obtained by ___________ those 2 numbers.

A Pythagorean triplet can be obtained by taking squares of _________ numbers.

What will the unit digit of square of (39+5)

• 0

• 1

• 4

• 6

• 9

Which number is added to 1640 to make a perfect square

• 34

• 45

• 41

• 44

What will be the unit digit on simplifying 57² + 9²

• 4

• 3

• 9

• 0

• 5

How many non-square numbers lie between 81² and 82²

Find the square root of 0.0625

• 0.25

• 2.5

• 0.025

• 25