Question

what will be the unit digit of the squares of the following numbers
(1) 81​

Answer 1

So, (i)81 - Unit digit of square of 81 will be 1.

Answer 2

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The unit digit of the square of 81 will be 1 ( one )

as ,

$\longrightarrow \: {81}^{2} = 81 \times 81$

so,

81 × 81

=> 1 × 1

=> 1