Welcome to the 3 rd and final installment of our mini-series on Number Properties. We’ve been doing a deep dive into Divisibility and Prime issues (see Part 1 and Part [...]

Welcome to the 2 nd installment of our dive into Number Properties. If you haven’t yet tried the first problem, start with the first article in the series . Let’s dive [...]

Most of my students are driven crazy by Number Properties. On the face of it, the topic seems straightforward: I know what positive and negative, odd and even are. Divisibility [...]

No introduction to this one—see what you can figure out and then we’ll talk about it! This is a GMATPrep® problem from the free exams. * “If n and y are [...]

A certain class of questions tends to have more going on than might be apparent on the surface. (I’m being intentionally vague as to the “certain class” – I’ll tell [...]

Data Sufficiency problems often have elegant shortcuts if we really understand the theory behind whatever the problem tests – and, sometimes, DS sets up some very tricky traps if we [...]

How can the GMAT disguise a prime number (or any other) problem? I asked this question a couple of years ago at the start of a very important article entitled [...]

What are number properties? This concept covers things that we often call “basic” – topics that we learned in middle school (or earlier): divisibility, factors and multiples, odds and evens, [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people that enter our challenge, the better the prizes! [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people that enter our challenge, the better the prizes! [...]

We’ve got another GMATPrep® word problem on tap for today, but this one’s in the area of divisibility (number properties). These kinds of problems often include a lot of math [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people that enter our challenge, the better the prizes! [...]

You've heard of Autotune the News. But have you tried autotuning GMAT exponent rules? [youtube]http://www.youtube.com/watch?v=3wavlUC223E[/youtube] Dave Ingber (Knewton's lead GMAT teacher) and RoboMath (our lead GMAT robot?) show you how a little [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people enter our challenge, the better the prizes! Question [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people enter our challenge, the better the prizes! Question [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people enter our challenge, the better the prizes. Question [...]

We’re making sections of  Grockit’s GMAT Course available to stream online for free! The course is taught by Grockit Founder Farb Nivi and covers the entire GMAT curriculum in 16 [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people enter our challenge, the better the prizes. Question [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people enter our challenge, the better the prizes. If [...]

Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people enter our challenge, the better the prizes. A [...]

If you're just starting your GMAT prep (or even if you've been at it for a little while), the Data Sufficiency section can be tricky. After all, who ever heard [...]

How can the GMAT disguise a prime number (or any other) problem? That’s exactly what we’re going to discuss today! We’re going to use the concept of prime to describe [...]

This is the third installment of our Thursdays with Ron posts.  Every other Thursday, our instructor Ron Purewal (known on the Beat the GMAT forums as lunarpower ) hosts a [...]

This is our latest Challenge Problem! As always, the problem and solution below were written by one of our fantastic instructors . Each challenge problem represents a 700+ level question. [...]

There is a Knewton shirt out in the veld, floating around all free. You can claim it if you answer this question correctly, and show your work. The first term [...]