Tips for Answering GRE Quantitative Comparison Questions

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  • 0:01 Quantitative…
  • 0:42 Look for Similarities
  • 1:51 Dealing with Numbers
  • 2:16 Working with Variables
  • 3:25 Lesson Summary
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Lesson Transcript
Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught math at a public charter high school.

Watch this video lesson to learn some tips you can use to help you answer the quantitative comparison questions on the GRE. You will see that often times you do not need to fully solve the question.

Quantitative Comparison Questions

If you are going to take the GRE, then it is almost certain that you will come across some quantitative comparison questions. These are questions where you compare two items. All quantitative comparison questions have the same four answer choices on the GRE test:

  • A) Quantity A is bigger.
  • B) Quantity B is bigger.
  • C) The quantities are equal.
  • D) The relationship cannot be determined.

If you can remember these four answer choices, you won't have to reread each choice for every single question. Because there are usually several quantitative comparison questions on the GRE, knowing these four answer choices will save you time. Now, for the tips.

Look for Similarities

The first tip is to look for similarities. Most times the quantities are given in such a way that you don't have to work out the whole problem before providing your answer, so when you are working the problem, do only as much work as you need to figure out which is bigger. In some problems, you will see a pattern to the quantities. Once you figure out the pattern you will see that one is bigger or not at all. For example, the two quantities 5(10) + 20 and 5(15) + 5(3) has a pattern where both quantities have a factor of five. We can rewrite the first quantity as 5(10)+5(4). Now our quantities are beginning to look similar. To finish our problem we can simplify it a bit further. We can rewrite the first quantity as 5(10+4) and the second quantity as 5(15+3). Adding the numbers in the parenthesis gives us 5(14) and 5(18). Do we need to finish the problem? No. We can see that both numbers have five outside the parenthesis. Which number has the bigger quantity inside the parenthesis? The second one. So, our answer is B.

Dealing with Numbers

Another tip when you see two numbers as quantities, your answer will never be the fourth one, D. Why? Because if your quantities are both numbers, then you will be able to figure out which is bigger. In our last example, we had two numbers and, as you saw, we were able to figure out which one is bigger. So if you see two numbers, even if there are math operators involved, you can immediately scratch off answer D from your possible choices.

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