Question

The One’s digit of the cube of '$23$' is:

• A. $6$
• B. $7$
• C. $3$
• D. $9$

Answer 1

The correct option is B

$7$

We know that,
The cube of numbers having $1,4,5,6\mathrm{or}9$ at one's place will end in $1,4,5,6\mathrm{or}9$
And, if the numbers have:
$2$ at one's place, then its cube ends in $8$
$8$ at one's place, then its cube ends in $2$
$3$ at one's place then its cube ends in $7$
$7$ at one's place then its cube ends in $3$
$0$ at one's place then its cube ends in $0$

Here, the one's digit in the number '$23$' is '$3$‘, So, its cube will end in ’$7$'.

Therefore, the correct option is B.