Question

If the square ends with 9, then the number has ___ or ___ in the units place.

• A. $3$ or $7$
• B. $4$ or $5$
• C. $9$ or $1$
• D. None of these

Answer 1

The correct option is A $3$ or $7$

Only those numbers, when squared will have 9 at their unit place are $3$ and $7$.

Because $3\times 3$ $=$ $9$

and $7\times 7$ $=$ $9$

Hence, Option A is correct answer.