Articles published in Quant

GMAT Data Sufficiency: Ratio Stories – Part 2

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Social-RatioStoriesRecently, we took a look at a story problem dealing with ratios, and I finished up by giving you a second problem to test your skills. How did you do?

If you haven’t already, try the GMATPrep® problem below and then we’ll talk about it. Give yourself about 2 minutes. Go! Read more

GMAT Data Sufficiency Ratio Stories — Part 1

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Social-RatioStories

How are you with story problems? Most math concepts can be presented in story form on the test and the GMAT test writers do like to get wordy with us. You’ve got a double task: you have to translate the words into math and then you still have to do the math! How can we get through these as efficiently as possible?

Try the GMATPrep® problem below and then we’ll talk about it. Give yourself about 2 minutes. Go!

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How to Tackle Every Single GMAT Problem (Seriously!) – Part 2

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Last time, I introduced you to a set of principles that tie together everything we need to do on the GMAT.

Blog-Tackle-Pt2

If you haven’t already read that article, go ahead and do so now.

Here’s our framework again:

228 - Q Process 3

Today, we’re going to try this out on a Data Sufficiency problem.

Try this DS problem from the GMATPrep® free exams.
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The Importance of Getting to No on the GMAT — Part 2

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Last time, we talked about how crucial it is to develop the instinct to go for the “No” when taking the GMAT. If you haven’t read the first installment, do so right now, then come back here to learn more.

I left you with this GMATPrep® problem from the free exams.

“*If 0 <r< 1 <s< 2, which of the following must be less than 1?

“I. r/s

“II. rs

“III. sr

“(A) I only

“(B) II only

“(C) III only

“(D) I and II

“(E) I and III”

Let’s talk about it now!

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The Importance of Getting to No on the GMAT — Part 1

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Social-No-Pt1Recently, a colleague of mine shared this very interesting puzzle published by the New York Times. (Thanks, Ceilidh!)

Go ahead and try it. I’ll wait. After you’ve tried the puzzle, you can read the short article that goes with it.

What did you learn about how humans tend to think? More important, what did you learn about how you think?

That tendency to look for the no, or to try to disprove something, is a trait shared by scientists, devil’s advocates, and great standardized test takers. You can learn to make this your natural reaction, too!

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How to Tackle Every Single GMAT Problem (Seriously!) — Part 1

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Wouldn’t it be nice to have one common thread among all GMAT problems you’ll ever do, something you do no matter what kind of problem or content area is being tested?

Blog-Tackle-Pt1

I’m here to answer your prayers. :)

Okay, obviously, there are many things you’re going to need to learn and practice in order to get a great GMAT score—these isn’t literally just one thing to learn. But it turns out that there is one set of principles tying together everything we need to do on the GMAT.

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How to Get the Most out of the GMAT Official Guides

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Blog-6-22-2015-OGs-3 (1)Now that the new 2016 Official Guide books are out, I’d like to talk about how to use these problems to get the most out of your study. I also want to talk about what not to do, as a lot of people end up essentially wasting these great study problems (not to mention valuable time!).

What should I NOT do?

Your goal is to learn from the Official Guide (OG) problems in such a way that, if you see something similar on the real test, you’ll recognize what to do on that new problem.

Keep some things in mind:

  1. Your goal is NOT to memorize how to do the problems that you’re studying. You won’t see these exact problems on the test! Can you tell me exactly how to do a particular problem? That’s great. But I care far more whether you can tell me how you know what to do and why you want to take the steps that you take. If you can, then you’ll know how to think your way through a new problem on the real test.
  2. Your goal is NOT to try to get everything (or even most problems) right. Sometimes, what you want to recognize fairly quickly is that you should guess immediately and move on. Other times, you want to recognize that your best strategy is to spend some time making an educated guess—and then move on. Still other times, you’ll have to be able to recognize that you initially thought you could do this one but it’s just not happening, so you’ll need to cut yourself off, guess, and move on.

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Everything you need to know about the New Official Guides, Part 3

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I have now done every last one of the new quant problems in both new books—and there are some really neat ones! I’ve also got some interesting observations for you. (If you haven’t yet read my earlier installments, start here.)

In this installment, I’ll discuss my overall conclusions for quant and I’ll also give you all of the problem numbers for the new problems in both the big OG and the smaller quant-only OG.

What’s new in Quant?

Now that I’ve seen everything, I’ve been able to spot some trends across all of the added and dropped questions. For example, across both The Official Guide for GMAT® Review (aka the big book) and The Official Guide for GMAT® Quant Review (aka quant-only or the quant supplement), Linear Equation problems dropped by a count of 13. This is the differential: new questions minus dropped questions.

That’s a pretty big number; the next closest categories, Inequalities and Rates & Work, dropped by 5 questions each. I’m not convinced that a drop of 5 is at all significant, but I decided that was a safe place to stop the “Hmm, that’s interesting!” count.

Now, a caveat: there are sometimes judgment calls to make in classifying problems. Certain problems cross multiple content areas, so we do our best to pick the topic area that is most essential in solving that problem. But that 13 still stands out. :)

The biggest jump came from Formulas, with 10 added questions across both sources. This category includes sequences and functions; just straight translation or linear equations would go into those respective categories, not formulas. Positive & Negative questions jumped by 7, weighted average jumped by 6, and coordinate plane jumped by 5.

Given that Linear Equations dropped and Formulas jumped, could it be the case that they are going after somewhat more complex algebra now? That’s certainly possible. I didn’t feel as though the new formula questions were super hard though. It felt more as though they were testing whether you could follow directions. If I give you a weird formula with specific definitions and instructions, can you interpret correctly and manipulate accordingly?

If you think about it, work is a lot more like this than “Oh, here are two linear equations; can you solve for x?” So it makes sense that they would want to emphasize questions of a more practical nature.

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Everything you need to know about the New Official Guides, Part 2

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OG2016-Ads-2The new Official Guide books are here! Last time, we talked about the Quant portion of The Official Guide for GMAT, aka the OG or the big book. In this installment, we’ll discuss the Verbal section of the big book. Later installments will talk about the Quant Review and Verbal Review (the smaller books), as well as question lists for the new questions.

(Note: I have not yet had time to analyze the IR problems that come via your special online access. I’ll get to that soon—the quant and the verbal are higher priority!)

Part 1 included an overview of the changes to the whole book; I’ve included that overview here as well (the next section!), in case you’re reading this installment first. (The only difference is one sentence in the first paragraph.)

What’s new in OG 2016?

Approximately 25% of the questions are brand new, and there are some beauties in the mix. As I worked through the problems, I marveled anew at the skill with which the test writers can produce what I call elegant problems. On the verbal side, I loved how some of the new questions wove meaning into the issue of Sentence Correction; if you have been focusing on grammar and shortchanging meaning, you’re definitely going to need to change your approach.

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Everything you need to know about the New Official Guides, Part 1

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OG2016-Ads-2The new Official Guide books are here! Aren’t you excited?!?

Okay, I realize that most people probably aren’t as excited as I am. But there are still some interesting and useful things to know about these new books as you get ready to take the GMAT. So let’s talk about it!

In this installment, I’ll discuss additions and changes to quant sections for The Official Guide for GMAT® Review 2016, aka the OG or the big book. Keep an eye out for later installments, in which I’ll discuss the verbal section of the big book, as well as the Quantitative Review and Verbal Review books. I’ll also be providing you with a list of the new questions, in case you decide to study from both the 2015 and 2016 editions.

If you haven’t already bought your official guide books, then do buy these latest editions—sure you might be able to get a discount on the 2015 editions, but since you have to spend money anyway, you might as well work from the latest and greatest.

If you have already bought the older editions and are debating whether to buy the new ones, too, then you’ve got a decision to make. On the one hand, there are a lot of great new questions in the 2016 editions. On the other, the 2015 edition already has a ton of problems; you may not need even more. If it were me, I’d wait until I’d used up the ones in the materials I already have. If I still felt that I needed more beyond that, then I’d consider getting one or more of the new books.

What’s new in OG 2016?

Approximately 25% of the questions are brand new, and there are some beauties in the mix. As I worked through the problems, I marveled anew at the skill with which the test writers can produce what I call elegant problems. On the quant side, I saw example after example in which the problem can be solved with little to no computation as long as you can decode and understand the fundamental concept underlying the problem—that’s the real test-taking skill!

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