The very tricky and very nefarious “must be true” question type can foil the best math minds. Without practice, prep, and a good strategy, you might find yourself wasting a lot of time on these questions. Today I’ll cover a useful strategy for these questions and work through a problem in the Official Guide to […]

# Archive | Quantitative

## GMAT Tuesdays – Probability and Counting

Today we learn more about probability and counting. Probability questions involving counting are really just multi-step counting problems. Watch the video to learn more. And if you want even more practice, click here: GMAT Probability and Counting Techniques This week’s board:

## GMAT Tuesdays: Data Sufficiency – Watch Your Assumptions!

Don’t get caught assuming too much on the GMAT. They are looking for students to make big assumptions when they are trying to save time. In this Data Sufficiency question, there is a big trap for anyone who assumes too much about the problem. For more practice with traps on Data Sufficiency questions, click […]

## Manipulating Algebraic Equations and Expressions with Fractions: Systems of Equations

A student writes, Sometimes the answer explanation suggests that I clear fractions by multiplying an entire equation by a common denominator. Sometimes the answer explanation suggests that I manipulate just one side of an equation. How do I know which is better? This is a surprisingly subtle question. It turns out that the answer is […]

## Manipulating Algebraic Equations and Expressions with Fractions: A Word Problem

A student writes, Sometimes the answer explanation suggests that I clear fractions by multiplying an entire equation by a common denominator. Sometimes the answer explanation suggests that I manipulate just one side of an equation. How do I know which is better? This is a surprisingly subtle question. It turns out that the answer is […]

## Manipulating Algebraic Equations and Expressions with Fractions: Equations

A student writes, Sometimes the answer explanation suggests that I clear fractions by multiplying an entire equation by a common denominator. Sometimes the answer explanation suggests that I manipulate just one side of an equation. How do I know which is better? This is a surprisingly subtle question. It turns out that the answer is […]

## Manipulating Algebraic Equations and Expressions with Fractions: Another Example

## Manipulating Algebraic Equations and Expressions with Fractions: Expressions

## Manipulating Algebraic Equations and Expressions with Fractions: Answer Key

Ready to check your answers from yesterday’s Quick Quiz?