Question

If the square number ends with ___, then the number has $8$ or $2$ at the units place.

• A. $18$
• B. $6$
• C. $9$
• D. $4$

Answer 1

The correct option is D $4$

$2\times 2=4$ and $8\times 8=6\underset{–}{4}$ (the units place is $4$)

So, either $8$ or $2$ is necessary in the units place.