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Follow along with Salman Khan and others to study basic and advanced arithmetic, pre-algebra, algebra, geometry, trigonometry, statistics, precalculus, calculus and more.
Arithmetic and Pre-Algebra: Addition and SubtractionBasic Addition
Addition 2
Basic Subtraction
Subtraction 2
Level 2 Addition
Addition 3
Subtraction 3
Why borrowing works
Addition 4
Level 4 Subtraction
Subtraction Word Problem
Alternate mental subtraction method
Negative Numbers Introduction
Adding Negative Numbers
Adding integers with different signs
Adding/Subtracting negative numbers
Basic Multiplication
Multiplication 2: The Multiplication Tables
Multiplication 3: 10,11,12 times tables
Division 1
Division 2
Multiplication 4: 2-digit times 1-digit number
Multiplication 5: 2-digit times a 2-digit number
Multiplying Whole Numbers and Applications 2
Lattice Multiplication
Why Lattice Multiplication Works
Multiplying Whole Numbers and Applications 4
Multiplication 6: Multiple Digit Numbers
Multiplication 7: Old video giving more examples
Multiplying Whole Numbers and Applications 6
Division 3: More long division and remainder examples
Partial Quotient Division
Level 4 division
Partial Quotient Method of Division 2
Multiplying Whole Numbers and Applications 1
Multiplying and dividing negative numbers
Place Value 1
Place Value 2
Place Value 3
Rounding Whole Numbers 1
Rounding Whole Numbers 2
Rounding Whole Numbers 3
The Beauty of Algebra
Origins of Algebra
Abstract-ness
Descartes and Cartesian Coordinates
Variables Expressions and Equations
Variables and Expressions 1
Evaluating Expressions with Two Variables
Order of Operations Example
Simple Equations
Solving One-Step Equations
Solving One-Step Equations 2
One Step Equations
Evaluate a formula using substitution
Example of Solving for a Variable
Solving for a Variable
Solving for a Variable 2
Linear Equations 2
Equations 2
Solving Equations 1
Two-Step Equations
New Operator Definitions
Solving Equations 2
Equations 3
Equations with Variables on Both Sides
Multi-Step Equations
Multi-step equations 1
Multi-step equations 2
Solving Equations with the Distributive Property
Solving equations with the distributive property 2
Linear Equations 3
Linear Equations 4
Equation Special Cases
Sum of Consecutive Odd Integers
Integer sums
Rearrange formulas to isolate specific variables
Algebraic Word Problem
Basic Rate Problem
Averages
Application problems with equation in one variable
Percent Problems
Word Problem Solving 3
Taking percentages
Growing by a percentage
Another Percent Word Problem
More percent problems
Direct Variation 1
Proportionality Constant for Direct Variation
Direct Variation Application
Early Train Word Problem
Age word problems 1
Age word problems 2
Age word problems 3
Writing Proportions
Coverting Repeating Decimals to Fractions 1
Coverting Repeating Decimals to Fractions 2
Patterns in Sequences 1
Patterns in Sequences 2
Equations of Sequence Patterns
Finding the 100th Term in a Sequence
Basic Linear Function
Absolute Value Equations
Absolute Value Equations 1
Absolute Value Equations Example 1
Absolute Value Equation Example 2
Perimeter and Area Basics
Area and Perimeter
Perimeter of a Polygon
Circles: Radius, Diameter and Circumference
Parts of a Circle
Area of a Circle
Solid Geometry Volume
Cylinder Volume and Surface Area
Euclid as the Father of Geometry
Language and Notation of Basic Geometry
Lines, Line Segments, and Rays
Identifying Rays
Identifying Parallel and Perpendicular Lines
Angle Basics
Introduction to angles (old)
Measuring Angles in Degrees
Using a Protractor
Measuring Angles
Angle-a-trons
Acute Right and Obtuse Angles
Acute Obtuse and Right Angles
Complementary and Supplementary Angles
Identifying Complementary and Supplementary Angles
Angles (part 2)
Proof - Sum of Measures of Angles in a Triangle are 180
Triangle Angle Example 1
Angles at the intersection of two lines
Proof-Vertical Angles are Equal
Angles (part 3)
Angles formed between transversals and parallel lines
Proof - Corresponding Angle Equivalence Implies Parallel Lines
Angles of parallel lines
Angles of parallel lines 2
Triangle Angle Example 2
Triangle Angle Example 3
Finding more angles
The Angle Game
Angle Game (part 2)
More on why SSA is not a postulate
Angles Formed by Parallel Lines and Transversals
Point Line Distance and Angle Bisectors
Two column proof showing segments are perpendicular
Angle Bisector Theorem Examples
Angle Bisector Theorem Proof
Inscribed and Central Angles
Perpendicular Radius Bisects Chord
Inradius Perimeter and Area
2003 AIME II Problem 7
Watch videos of Salman Khan of Khan Academy and others teaching biology, chemistry, organic chemistry, physics, astronomy, computer science and more.
Top Science Class Videos:
Watch videos of Salman Khan of Khan Academy and others teaching history including U.S. history, French Revolution, Cold War, Communism, and more.
Top Science Class Videos:
Professor John Geanakoplos of Yale University lectures on Financial Theory.
Top Economics Lecture Videos:
Work through problems from College Board's 'Official SAT Study Guide' with Salman Khan.
SAT Preparation Videos:
Salman Khan works through actual test questions from past California Standards Tests, which have been released by the California State Board of Education and the Standardized Testing and Reporting (STAR) Program.
Algebra I Videos:
Education Q&A
Why the abstraction of mathematics is so fundamental.
By Salman Khan of Khan Academy
Heredity and Classical Genetics - Dominant and recessive traits - Heterozygous and homozygous genotypes. By Salman Khan of Khan Academy
The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replication.
By Salman Khan of Khan Academy
By Salman Khan of Khan Academy
From Lee's Surrender to Grant to Lincoln's Assassination. By Salman Khan of Khan Academy
From the Convocation of the Estates General to the storming of the Bastille. By Salman Khan of Khan Academy
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