Quant · Quantitative Comparison
GRE Quantitative Comparison practice
Forty original Quantitative Comparison questions, with the four-choice answer format and the cases that make cannot be determined the right answer. Full solutions for every one. Free, no signup.
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Quantitative Comparison practiceEasy
Question 1 of 40
A rectangle has a length of and a width of .
Compare Quantity A and Quantity B.
Quantity A
The perimeter of the rectangle
Quantity B
How to approach it
A method for Quantitative Comparison.
Know the four choices cold
Quantity A greater, Quantity B greater, the two equal, or the relationship cannot be determined. The fourth option is the one most people forget when a variable is unconstrained.
Test boundary and special values
Try 0, 1, a negative, and a fraction. If two valid values give different comparisons, the answer is D, cannot be determined.
Compare, do not compute
You rarely need the exact values. Simplify both quantities the same way, or subtract one from both, until the comparison is obvious.
Questions
Quantitative Comparison, answered.
Quantity A is greater, Quantity B is greater, the two are equal, or the relationship cannot be determined from the information given.
When the quantities involve a variable that can take values giving different comparisons. If you can find two cases that disagree, the answer is D.
Yes, and you should, but test several kinds: zero, one, negatives, and fractions. One example is not enough to prove A, B, or C.
Not necessarily. Use the stated values and relationships, not the look of the figure.