Question

What will be the unit digit of the square of the numbers :81​

Answer 1

Answer:

The unit digit of a perfect square can be only 0, 1, 4, 5, 6 or 9. The square of a number having: 1 or 9 at the units place ends in1. 2 or 8 at the units place ends in 4. 3 or 7 at the units place ends in 9.

Answer 2

♡Answer♡

Unit digit of a square of a number is equal to the unit digit of square of unit digit of that number. So, (i)81 - Unit digit of square of 81 will be 1.

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