To save time on the GRE, you should get comfortable with estimating. Even if estimating doesn’t give you the 100% accurate answer, it generally narrows it down to one obvious choice (if you’re good at estimating and round up and down appropriately). Some questions even tell you to approximate, so there really is no point calculating the precise answer there.
Numerical Estimations
Practice estimating with percentages. This will save you a lot of time, particular on the questions with charts and graphs. I tend to like figuring out 1%, 5% or 10% represents and working from there depending on the question.
Visual Estimations
Visual estimations usually work for things like graphs or simple diagrams. The important lesson in visual estimations is not to do it for triangles. You should always assume that triangles are never drawn to scale and when looking at diagrams of triangles, you should only apply rules of triangles e.g. sum of interior angles is 180, isosceles triangles have two equal angles and two equal sides etc.
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