Current tag: quantitative strategy lesson 2.
Video: Solving for One Variable Among Many in DS Questions
In this GMAT video, Rich begins by presenting a sample DS question. The question tests your ability to solve for the value of an expression — without necessarily solving for the variables in that expression. Jess and Rich then go on to explain the best way to solve for one… Read more >
Video: How to Solve for the Value of an Expression (Without Solving for its Variables!)
As Jess and Rich explain in this GMAT video, oftentimes on Data Sufficiency problems you’ll be given more variables than you have equations. This happens for two main reasons: You’re just given more variables than equations (you know, because it’s fun) You’re given as many variables as equations, but not… Read more >
Video: The Basics of Independent and Dependent Equations
In this video, Jess and Rich cover the basics of independent and dependent equations on Data Sufficiency questions. Here are some of the concepts they discuss: Systems of equations are dependent if one equation can be formed by manipulating and/or combining the others. If no manipulation/combination can create dependent equations,… Read more >
Video: Three Classic DS Questions Involving Systems of Equations
In this video, Jess and Rich cover helpful strategies for solving Data Sufficiency questions involving systems of equations. There are three sample problems to try on your own: pause the video at 00:37, 5:30, and 8:00 to try your hand at each one. After you’ve given each one a shot,… Read more >
Video: How to Simplify Data Sufficiency Questions
In this GMAT video, Jess and Rich show you the best methods for simplifying Data Sufficiency prompts and translating equations into more helpful forms. They present two sample problems (pause the video at 00:21 and 4:10 to try them out for yourself), and then walk you through the most efficient… Read more >
Video: Testing Cases in Data Sufficiency
In this video, Jess and Rich talk about “testing cases” in Data Sufficiency problems — i.e. coming up with example numbers and trying them out to see what happens. The goal of this strategy is to help you determine if the DS question prompt is always, sometimes, or never true…. Read more >
Video: Don't Solve Data Sufficiency Problems!
In this video, Rich and Jess kick off a quant session all about Data Sufficiency. In this first portion of the lesson, they cover the “Don’t Solve” strategy for DS — which, as Jess points out, is one of the best math tips around! Remember: for DS problems, all you… Read more >
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