From the course: Preparing for the GMAT

Unlock the full course today

Join today to access over 22,600 courses taught by industry experts or purchase this course individually.

Data sufficiency testing numbers

Data sufficiency testing numbers

From the course: Preparing for the GMAT

Start my 1-month free trial

Data sufficiency testing numbers

“

- [Instructor] One of the fundamental skills you'll need when working with data sufficiency questions is the ability to efficiently test numbers. In this video, we'll go over the best ways to use numbers to determine statement sufficiency. The best numbers I think to test are these guys, two, one, negative two and negative one, one-half, negative one-half, and zero. You don't have to test them all every time. In fact, you probably wouldn't do that in most cases, but these are small, but easy to work with and they do different things from each other. They represent most other numbers too. In other words, two, when you square it, gets bigger just like three gets bigger when you square it, just like four gets bigger when you square it. Then one does something quite different. Negative two does the same thing as negative three and negative four when you square it. We can get away with using these numbers instead of testing like two, three, four a lot of the time anyway. For ease of…

Contents