Question

What will be the unit s digit of the squares of the following numbers?

(i) 71 (ii) 599 (iii) 2783 (iv) 1234

Answer 1

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We know that the unit s digit of the square of a number having digit at unit s place as 1 or 9 is 1

Therefore, unit s digit of the squares of numbers 71 and 599 are each equal to 1

Since, the unit s digit of the square of a number having 3 as unit s digit is 9.

So, the unit s digit of the square of the number 2783 is 9.

The unit s digit of the square of the number 1234 is 6 , because the unit s digit of the square of a number having 4 or 6 at units place is 4.