Quantitative Reasoning Lessons

General Math Strategies

Intro to GMAT Math

4:39

Mental Math: GMAT Estimation

3:44

Mental Math: Dividing by 5

2:49

Mental Math: Doubling and Halving

6:08

Mental Math: Squaring Shortcuts

12:26

Number Sense

10:41

The Use and Abuse of Formulas

2:52

Learn from Your Mistakes

4:43

Arithmetic and Fractions

Properties of Real Numbers

8:25

Positive and Negative Numbers - I

6:00

Mental Math, Addition, and Subtraction

5:24

Positive and Negative Numbers - II

7:44

Order of Operations

11:26

Intro to Decimals

11:28

Multiples of 10

9:45

More on Scientific Notation

8:36

Intro to Fractions

9:27

Conversions with Fractions and Decimals

8:14

Fraction Properties - I

13:34

Comparing Fractions I

11:33

Comparing Fractions II (Advanced)

12:20

Operations with Fractions

8:22

Fraction Properties - II

7:57

Mixed Numerals and Improper Fractions

10:30

Operations with Proportions

6:36

Word Problems with Fractions

3:37

Percents and Ratios

Intro to Percents

5:27

Working with Percents

3:35

Number Sense and Percents

4:23

Percent Increases and Decreases

10:35

Sequential Percent Changes

6:53

Simple and Compound Interest

13:59

Intro to Ratios

9:57

Combining Ratios

11:17

Ratios and Rates

6:15

Ratios and Percents

5:36

Integer Properties

Divisibility

10:12

Divisibility Rules

8:01

Multiples

8:29

Prime Numbers

6:28

Prime Factorization

8:17

Counting Factors of Large Numbers

12:15

Squares of Integers

5:30

Greatest Common Factor

5:57

Least Common Multiple

9:18

GCD LCM Formula

4:40

Even and Odd Integers

10:07

Testing Cases

6:02

Remainders

11:40

Integer Properties Strategies

6:33

Algebra, Equations, and Inequalities

Intro to Algebra

7:56

Simplifying Expressions

6:32

Multiplying Expressions

7:52

FOIL Method

8:50

Factoring - GCF

5:10

Factoring - Difference of Two Squares

12:01

Factoring - Quadratics

7:50

Factoring - Combined

4:25

Advanced Numerical Factoring

7:09

Factoring - Rational Expressions

5:11

Basic Equation Solving

6:19

Eliminating Fractions

9:11

Quadratic Equations

8:04

Two Equations, Two Unknowns - I

7:58

Two Equations, Two Unknowns - II

10:22

System - Number of Solutions

7:21

Three Equations with Three Unknowns

9:00

Absolute Value Equations

10:23

Function Notation

12:50

Strange Operators

7:46

Inequalities - I

13:55

Inequalities - II

11:07

Absolute Value Inequalities

9:35

Simplifying with Substitutions

5:26

Word Problems

Intro to Word Problems

1:37

Assigning Variables

9:14

Writing Equations

7:42

Number of Variables

8:23

Age Questions

5:02

Intro to Motion Questions

9:22

Average Speed

10:19

Multiple Traveler Questions

9:04

Shrinking and Expanding Gaps

12:00

Work Questions

9:34

Growth and Decay

4:01

Mixture Questions

10:00

Intro to Sets and Venn Diagrams

9:55

Double Matrix Method

9:23

Three Criteria Venn Diagrams

7:49

Intro to Sequences

7:48

Arithmetic Sequences

8:24

Recursive Sequences

10:23

Inclusive Counting

4:34

Sums of Sequences

7:32

Consecutive Integers

9:52

Backsolving

7:51

Intro to VICs

11:11

VICs - Algebraic Approach

9:53

VICs - Picking Numbers

18:41

Powers and Roots

Intro to Exponents

9:09

Exponential Growth

8:39

Laws of Exponents - I

12:46

Negative Exponents

11:02

Laws of Exponents - II

10:42

Units Digit Questions

7:30

Square Roots

14:53

Other Roots

11:53

Properties of Roots

4:05

Simplifying Roots

7:53

Operations with Roots

12:41

Equations with Square Roots

9:43

Fractional Exponents

7:13

Exponential Equations

6:56

Rationalizing

13:54

Working with Formulas

10:25

Statistics

Mean, Median, Mode

9:32

More on Mean and Median

4:34

Weighted Averages I

7:00

Weighted Averages II (Advanced)

8:31

Range and Standard Deviation

16:06

More on Standard Deviation

17:25

Counting

Introduction to Counting

4:22

Fundamental Counting Principle

7:39

FCP with Restrictions

4:36

Factorial Notation

4:05

Counting What You Don't Want

9:39

Counting with Identical Items

6:18

Eliminating Repetition

5:55

Combinations

7:50

When to Use Combinations

9:14

Calculating Combinations

9:50

Permutations and Combinations

7:54

Case Counting

7:26

Counting Strategies

3:17

Probability

Intro to Probability

5:59

Complementary Events and Simple Rules

3:22

Mutually Exclusive Events

2:33

Probability of Event A OR Event B

3:50

Examples of the OR Rule

2:02

Independent Events

6:26

Examples of the AND Rule

4:44

Generalized AND Rule

3:52

Examples of Generalized AND Rule

7:05

Binomial Situation

8:40

The "At Least" Scenario

6:25

Analyzing Questions

8:47

Using Counting Techniques

5:14

Listing vs. Counting vs. Probability Rules

6:31

General Probability Strategies

4:39

Guessing Strategies

5:50

Coordinate Plane

The Coordinate Plane

7:14

Graphing Lines

5:19

Vertical and Horizontal Lines

9:04

Slope

12:39

Intercepts

5:46

Slope-Intercept Form

8:18

Writing Equations of Lines

11:35