Question

What will be the units digit of the square of the given number $39$?

• A. $9$
• B. $3$
• C. $1$
• D. $0$

Answer 1

The correct option is C $1$

Unit digit of multiplication of 2 numbers is obtained by taking the last digit of the multiplication of two numbers i.e. the digits in the unit place

Units digit of $39\times 39$ is obtained by taking the last digit of $9\times 9=81$

$\Rightarrow$ Unit digit of square of $39$ is $1$.