The following three tips will be extremely useful for you in solving Quantitative Comparison questions.


While many QC questions can be answered by simplifying or solving algebraic expressions (as we did above) or using formulas, some cannot. In such cases, testing various possible values for variables may help determine which quantity is greater. When we plug in numbers, however, we do not do it blindly. We use the given information to guide us on which numbers to test, and then we can strategically consider testing the following types of numbers:

• Zero
• One
• Positive proper fraction
• Negative proper fraction
• Positive integer
• Negative integer

Memorize this list. Keep in mind that it is rare you will need to test all six types of numbers to arrive at a correct answer. In fact, the goal is to test the fewest numbers possible.


While this tip may seem obvious, it can’t go without saying: the better you know GRE quant formulas and rules, the more effectively you will answer QC questions. For example, if you do not know exponent rules, how can you expect to answer a QC question on exponents? If you do not know geometry formulas, how can you answer a QC geometry question correctly?


In certain QC questions, you will be provided with what looks like some very thorny information, which is meant to intimidate you. However, in these circumstances, you often can simplify the information presented, and thus more easily evaluate the question.

• Quantitative Comparison questions sure can give our brains some exercise! Here are the 5 keys to mastering QC questions:
• Memorize the standard answer choices, which are the same for all QC questions.
• Memorize the list of key numbers to substitute if there is a question with the same variable in both quantities.
• Know your math formulas. They are sometimes necessary, and they can always save you a bit of time.
• Keep an eye out for expressions and equations to simplify.
• Practice, practice, practice!

Happy Studying!

Warmest regards,
Scott