Question

What will be the units digit of the square of the following numbers? 1)39

Answer 1

Answer:

Square of 39 is 1521. So the units digit of the square is 1

Answer 2

Answer:

Question 1: What will be the unit digit of the squares of the following numbers?

(i) 81

Answer: 1

Explanation Since, 12 ends up having 1 as the digit at unit’s place so 812 will have 1 at unit’s place.

(ii) 272

Answer: 4

Explanation: Since, 22 = 4, therefore, square of 272 will have 2 at it's unit place.

So, 2722 will have 4 at unit’s place

(iii) 799

Answer: 1

Explanation: Since, 92 = 81, So, 7992 will have 1 at unit’s place

(iv) 3853

Answer: 9

Explanation: Since 32 = 9, so, 38532 will have 9 at unit’s place.

(v) 1234

Answer: 6

Explanation: Since, 42 = 16, so, 12342 will have 6 at unit’s place