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:

# Archive | Quantitative

## 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?

## Manipulating Algebraic Equations and Expressions with Fractions: A Quick Quiz

## GMAT Tuesdays: Problem Solving – Figures Drawn as Accurately as Possible

As you work through problem solving questions, you will see a lot of figures, charts, shapes, and lines! But can you trust them? What can you assume about those shapes? This week, I dive in and answer these questions!