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Question

If the digit at unit place of a square number is 1, then it is a square of a number___.



Correct Answer
A

whose unit place digit is either 9 or 1.

Your Answer
B

whose unit place digit is 7.

Your Answer
C

whose unit place digit is 8.

Your Answer
D

whose unit place digit is either 5 or 1.


Solution

The correct option is A

whose unit place digit is either 9 or 1.


The square of a number 9 = 9 × 9 = 81

The square of 19 = 19 × 19 = 361

The square of 29 = 29 × 29 = 841

The square of 21 = 21  × 21 = 441

Therefore the unit place digit of a square root has to be either 9 or 1.

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