The GRE Quantitative Reasoning section (aka GRE Math) is foundational in the sense that many of the questions can be answered with the creative use of basic mathematics; this means you will be asked a lot of different questions types that are ultimately foundational in nature. Getting back to the basics is an important part of the concepts and strategies employed in the Test Masters GRE Online course. Check out this sample clip below, in which a Test Masters instructor explains some of the basic properties of angles you should be familiar with.
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