What will be the unit digit of the squares of the following numbers?
(i) 81
(ii) 272

Given:

Given numbers are: 

(i) 81
(ii) 272

To do:

We have to find the unit digit of the squares of the given numbers.

Solution:

We know that,

Unit digit of square of any number will be the unit digit of square of its last digit.

Therefore,

(i) Unit digit of square of 81 $=$ Unit digit of square of $1$

$1^2=1$.

Therefore, unit digit of $(81)^2$ is 1.

(i) Unit digit of square of 272 $=$ Unit digit of square of $2$

$2^2=4$.

Therefore, unit digit of $(272)^2$ is 4.

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Updated on: 10-Oct-2022

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