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If you’re solving a GMAT question, you probably want to choose the fraction because it’s much more likely that you are finding 75% of 400 than 423.
The Problem Solving format is designed to test basic mathematical skill and understanding of elementary concepts from the three content areas.
Moreover, Problem Solving also tests the ability to reason quantitatively, solve quantitative problems, and interpret data presented in the form of graphs.
Remember that the GMAT test-writers study the way that test-takers make mistakes.
The GMAT test-writers use that knowledge to come up with wrong answers.
It’s just that doing so may take more time than you really have.
However, there’s often a simpler—and faster—approach that involves little more than some basic math.When that occurs, it’s easier to run through multiple scenarios to their conclusion and find the best answer that leads to growth and profit.A problem can be a real break, a stroke of luck, opportunity knocking, even a chance to get out of an everyday rut and make yourself or some situation better.Teachers tend to care more about the work that you do to solve a problem than the actual answer that you get.The GMAT, of course, cares only that you select the correct answer.In other cases, you may realize that there are only one or two answers that even make sense.This kind of question may require no calculations at all if you pay attention to the answer choices!Some GMAT questions entice you to use math that is actually more sophisticated than you really need for the GMAT.It’s not that you can’t solve the questions using sophisticated math.The GMAT really doesn’t care that much about testing your raw calculating ability.As a result, the test-writers tend to use numbers in the problems that make the math work out nicely.