Math Lessons

General Math Strategies

Intro to GRE Math

6:04

Mental Math: GRE Estimation

7:55

Mental Math: Dividing by 5

2:49

Mental Math: Doubling and Halving

10:03

Mental Math: Squaring Shortcuts

12:26

Number Sense

10:41

The Use and Abuse of Formulas

2:52

Learn from Your Mistakes

10:32

Intro to Quantitative Comparison

13:09

QC Strategies - Estimation

10:08

QC Strategies - Matching Operations

7:53

Plugging In Overview

8:00

Plugging In for Integer Properties

4:36

Plugging In for Percents

7:32

Plugging In for Word Problems

7:29

Arithmetic and Fractions

Properties of Real Numbers

8:25

Positive and Negative Numbers - I

6:00

Mental Math, Addition, and Subtraction

6:19

Positive and Negative Numbers - II

10:10

Order of Operations

11:26

Intro to Decimals

11:28

Rounding

6:19

Multiples of 10

9:45

Intro to Fractions

11:10

Conversions: Fractions and Decimals

8:14

Fraction Properties - I

8:35

Comparing Fractions I

10:25

Comparing Fractions II (Advanced)

10:34

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

Integer Properties

Divisibility

10:10

Divisibility Rules

8:01

Multiples

9:54

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

5:32

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

Picking Numbers

12:56

Powers and Roots

Intro to Exponents

9:09

Exponential Growth

8:39

Law of Exponents - I

12:46

Negative Exponents

11:02

Law of Exponents - II

10:42

Units Digit Questions

7:30

Square Roots

14:53

Other Roots

11:52

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

Geometry

Lines and Angles

16:06

Triangles - Part I

11:32

Assumptions & Estimation

7:31

Geometry Strategies - Part I

3:44

Triangles - Part II

14:54

Right Triangles

13:54

Similar Triangles

11:27

Special Right Triangles

11:59

Quadrilaterals

17:35

Area of Quadrilaterals

6:30

Polygons

7:30

Regular Polygons

7:08

Circles

6:03

Circle Properties

12:02

Circles, Arcs, and Sectors

6:39

Volume and Surface Area

12:15

Scale Factor and Scaling

8:21

Units of Measurement

8:05

Geometry Strategies - Part II

4:14

Coordinate Geometry

The Coordinate Plane

7:14

Graphing Lines

5:19

Vertical and Horizontal Lines

9:00

Slope

16:46

Intercepts

8:34

Slope-Intercept Form

7:55

Writing Equations of Lines

11:35

Distance Between Two Points

8:00

Reflections in the x-y Plane

9:39

Graphs of Quadratics

7:42

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 Standard Deviation

17:25

Normal Distribution

11:06

Quartiles and Boxplots

13:33

More on Boxplots

5:39

Percentiles

9:09

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

7:33

Combinations

7:49

When to Use Combinations

9:14

Calculating Combinations

10:02

Permutations and Combinations

7:53

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

Data Interpretation

Intro to Data Interpretation

2:12

Data Interpretation Strategy

8:56

Types of DI Graphics

12:13

Scatter Plots

10:10

Unconventional Graphs

10:32

Advanced QC Strategies

QC Questions & Inequalities

12:55

QC Strategies - Picking Numbers

18:02

QC Questions & Algebra

10:25

QC Questions & Geometry

15:26

QC Questions & Integer Properties

9:59

Summary of QC Strategies

4:49