What will be the unit digit of the square of 81?

Given :

The given number is 81.

To do :

We have to find the unit digit of the square of 81

Solution :

We know that,

If the last digit of a number is 1 or 9, its square ends in 1.

Therefore,

The unit digit of square of 81 is 1. 

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Updated on: 10-Oct-2022

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