### The Remainder Cycle

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**One common complaint I hear from my students is that they ‘haven’t done math like this since high school.’ And they’re pretty much right: the concepts in the Quant section are by and large wrapped up by Algebra II. But for some subjects, my students drastically underestimate how long it has been since they’ve thought about them. One such subject: remainders on the GMAT. Read more**

### Breaking GMAT Study Barriers: Content vs. Process

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**You’ve been engaged in GMAT study for a while, maybe taken a course, maybe just done a lot of studying on your own, done lots of OG questions, taken several practice tests, and your score just seems stuck. You feel like you know a lot more than you used to, and when you look at the answer explanations they make sense, but your score just won’t go up. You look at your assessment reports from your practice exams and practice more questions in the areas of weakness, but your score still stays stuck. Sound familiar? Read more**

### Stop Careless GMAT Quant Errors

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**Here’s a careless error that any of us might make:**

x – 7 – 2x + 4 = 3x

-x – 3 = 3x

-3 = 2x

x = -1.5

Did you spot the error? If yes, give yourself a pat on the back and keep reading. If not, go back and review each step. This time, as you think through it, you can only use the terms *added*, *subtracted*, *multiplied*, and *divided*. On each line, identify which of those operations we used, and how we used it. Read more

### Know the GMAT Code: Translation Traps

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The problem we’re going to talk about today is a work of art. (Yes, I’m a geek. Did you not know that already? )

But I’m serious: it’s a thing of beauty. It looks *super* easy. It’s not—there are traps all over the place. The GMAT test writers have a genius for tying us into knots! Read more

### The GMAT Testing Cases Process: Specified, Demystified, & Put into a Flowchart

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**It’s become a bit of a running joke in my classes that I say, “The GMAT is a game of [a thing].” Every time I say it, I make it sound like I’ve revealed the hidden key to GMAT mastery: Read more**

### The GMAT Official Guide 2018 Edition, Part 4

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In the previous three installments of this series, I summarized some of the big messages and discussed some of the interesting problems I spotted in the GMAT Official Guide 2018. (If you’d like, you can start with the first installment and work your way back here.)

Today, I’ve got lists for you—the problems that are new to the GMAT Official Guide 2018 (by chapter and problem number). Read more

### The GMAT Official Guide 2018 Edition, Part 2

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The new GMAT Official Guide 2018 books have landed and I’ve got the scoop for you! (If you’d like, you can start with the first installment of this article series.) Today’s post focuses on Data Sufficiency. Read more

### Un-Educated Guessing on the GMAT: Problem Solving Edition

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**Do you remember that feeling of being in math class and the teacher asks a question that you really should know, but you don’t, and then you hear your name called to answer the question? Maybe your heart starts racing, your mind blanks even more, and in an attempt to avoid embarrassment, you just start talking, desperately hoping you land somewhere close to the answer. **

As a high school teacher, I saw this all the time from the teacher side. And I would smile and thank the student for trying, but usually while thinking “just go ahead and admit that you don’t know!” Read more

### Why Do We Care about Yes/No Data Sufficiency Questions?

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**GMAT Data Sufficiency questions can seem a little mysterious. (If you’re just getting started, or if you need a refresher, here’s a great article on the basics of Data Sufficiency.) These problems are more like logic puzzles than math questions. That makes Data Sufficiency a good opportunity for those of us who want to score well on Quant, but don’t like doing math! However, you might have some questions about Data Sufficiency as you start to understand the problem type a little better. Here’s one of them: ****why do we categorize Data Sufficiency questions into “yes/no” and “value”?** Read more

### What Your Math Teacher Didn’t Tell You About PEMDAS

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**Here’s a phrase that might bring back some memories from middle school math class: Please Excuse My Dear Aunt Sally, or PEMDAS. (If you went to school outside of the U.S., you may have learned the acronym BEDMAS or BODMAS, instead.) You use this phrase to decide what order to do mathematical operations in: Parentheses first (from inside to outside), then Exponents, then Multiplication and Division (left to right), then Addition and Subtraction (also left to right). **

PEMDAS isn’t terribly fancy stuff. It’s just a useful little tool that helps us communicate clearly—it’s what tells us, for instance, that “2x(3+4)” means something different from “2×3 + 4.” But if there’s one thing the GMAT loves, it’s making things look more complicated than they really are. Read more