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Welcome to the 3^rd and final installment of our mini-series on GMAT Number Properties. We’ve been doing a deep dive into Divisibility and Prime issues (see Part 1 and Part 2), exploring how the GMAT can disguise these topics and get us to fall into traps.

Here’s your third GMATPrep® problem from the free exams—and our hardest one yet. Good luck! Read more

Most of my students are driven crazy by GMAT Number Properties. On the face of it, the topic seems straightforward: I know what positive and negative, odd and even are. Divisibility stuff is a little more complicated, but come on: this was taught in school when we were 10! How hard can it be? Read more