Quantitative Reasoning covers high-school level arithmetic, algebra, geometry and data analysis. About a third of questions are quantitative comparisons, where you decide which of two quantities is greater.
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What the GRE Quantitative Reasoning section covers
Arithmetic
Algebra
Geometry
Data Analysis
Quantitative comparison: test cases
When a variable is involved, try positive, negative, zero and fractional values. If different values give different results, the answer is that the relationship cannot be determined.
Simplify both sides
You can add, subtract or multiply both quantities by the same positive number to compare them more easily.
Read the data carefully
Data questions often hinge on the difference between a percent and a percentage-point change, or between a total and an average.
Common mistakes
Assuming a variable is a positive integer when the question doesn't say so.
Using the calculator for work that is faster by estimation.
Mixing up percent change with percentage points.
How to study this section
Memorise common fraction–decimal–percent equivalents.
For every missed comparison question, find the value of the variable that breaks your first guess.
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