Squaring a number ending with 5

 Squaring a number ending with 5

Squaring is multiplying a number by itself. let's have a look at how to square ending in 5.

Example 1

Find a square of 65

65 × 65

step 1: after 6 comes 7 , so we multiply 6 by 7 and write down the answer 42

step 2: we multiply the last digit 5 × 5 = 25

step 3: write down the complete answer 4225

square of 65 is 4225

Example 2

Find a square of 115

115 × 115

step 1: after 11 comes 12 , so we multiply 11 by 12 and write down the answer 132

step 2: we multiply the last digit 5 × 5 = 25

step 3: write down the complete answer 13225

square of 115  is 13225

exercise

Find out square of the following number

1. 85

2. 95

3.105

4. 45

5. 205