Question

Which among 72^2 , 81^2 ,96^2 , 77^2 would end with digit 9?

Answer 1

Step-by-step explanation:

i)

72^2

2/4 =1/2

72 will not end with 9

ii)

81^2

2/4 = 1/2

81 will also not end with 9

iii)

96^2

2/4 = 1/2

96 will also not end with 9

iv)

77^2

2/4 = 1/2

77 will also not end with 9

hope it helps you

Answer 2

Just see the unit digits
The unit digit of the square of the unit digit of the number will be the unit digit of the result
Here, 77^2
Unit digit is 7
7^2= 49
So, 77^2 will end with 9