Question

What will be the unit digit of the squares of the following numbers ? 81, 272, 729?

Answer 1

There is a property of finding squares of real numbers.

The square of no. with unit digit 1 and 9 always have 1 in its unit digit's place.
The square of no. with unit digit 2 and 8 always have 4 in its unit digit's place.
The square of no. with unit digit 3 and 7 always have 9 in its unit digit's place.
The square of no. with unit digit 4 and 6 always have 6 in its unit digit's place
The square of no. with unit digit 5 always have 5 in its unit digit's place.

Therefore, 81² will have 1 in its unit place.
272² will have 4 in its unit place.
729² will have 1 in its unit place.

you can check it by calculating it.
81² = 6561
272²=73984
729²=531441

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Answer 2

what will be the unit digit of the square of the following number 3856