A "simple square" is any integer greater than 1 that has only three positive integer factors - itself, its square root, and 1. Which of the following is a simple square?

(A) 121
(B) 100
(C) 81
(D) 64
(E) 33

Show/Hide Answer


Choice A
Level of Difficulty E M H

The square root of 121 is 11, so if the only factors or 121 are 1, 11, and 121, then 121 is a simple square by definition. The only thing left to determine is whether 121 has any other factors. With a calculator, it's fairly easy to determine that there are no others. So, the only simple square listed is 121, or choice A.

Our SAT tutors can help you become very proficient with all types of math SAT questions.

Earn 5% cash for every purchase you refer.
Live Chats