# SAT Math Multiple Choice Practice Question 33: Answer and Explanation

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**Question: 33**

**11.** The number n satisfies the following properties:

I.It has three digits.

II.Its units digit is the sum of its tens digit and its hundreds digit.

III.It is a perfect square.

Which number could be n?

A. 156

B. 400

C. 484

D. 516

E. 729

**Correct Answer:** E

**Explanation:**

E. All the numbers have three digits. Only Choices (A), (D), and (E) have a units (ones) digit that equals the sum of the other two digits. And, using a calculator, you can see that the square roots of 156 and 516 are decimals, while the square root of 729 is 27, which makes it your answer.