Question

What will be the unit's digit of the square of the given number $297$?

• A. $9$
• B. $7$
• C. $3$
• D. $1$

Answer 1

The correct option is A $9$

Unit's digit of multiplication of two numbers is obtained by taking the last digit of the multiplication of two numbers i.e. the digits at the unit place

Unit's digit of $297\times 297$ is obtained by taking the last digits i.e. $7\times 7=49$

$\Rightarrow$ Unit digit of square of $297$ is $9$.