Question

What will be the unit digit of the squares of the following numbers ?
(a) 272 (b) 105 (c) 1234 (d) 52689
(e) 181 (f) 12796​

Answer 1

Step-by-step explanation:

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

Answer 2

272 » last digit = 2

» 2×2 = 4

» unit digit of the square = 4

105 » last digit = 5

» 5×5 = 25

» unit digit of the square = 5

1234 » last digit = 4

» 4×4 = 16

» unit digit of the square = 6

52689 » last digit = 9

» 9×9 = 81

» unit digit of the square = 1

181 » last digit = 1

» 1×1 = 1

» unit digit of the square = 1

12796 » last digit = 6

» 6×6 = 36

» unit digit of the square = 6

Hope this will help....