Math

Algebra

Introduction to algebra

Overview and history of algebra

Linear equations

Converting repeating decimals to fractions

Ratios and proportions

Systems of equations and inequalities

Solving systems with elimination (addition-elimination)

Solving systems with substitution

Super fast systems of equations

Thinking about solutions to systems

Arithmetic

Arithmetic and pre-algebra

Addition and subtraction

Intro to addition and subtraction

Fractions

Adding and subtracting fractions with unlike denominators

Adding and subtracting mixed number with unlike denominators

Mixed number addition and subtraction

Mixed number multiplication and division

Calculus

Indefinite and definite integrals

Indefinite integral as anti-derivative

Riemann sums and definite integration

U-substitution

Early math

Counting

Counting small numbers

Geometry

Points, lines, and planes

Introduction to Euclidean geometry

Probability and statistics

Independent and dependent events

Basic probability

Dependent probability

Partner Content

MIT+K12

Physics

Oldest

Example 1: Solving systems by substitution

Khan Academy
1236
03:43
Example 2: Solving systems by substitution

Khan Academy
1121
04:05
Example 3: Solving systems by substitution

Khan Academy
1362
06:03
The Substitution Method

Khan Academy
1178
04:38

Substitution Method 2

Khan Academy
1285
03:43
Substitution Method 3

Khan Academy
1151
05:57
Practice using substitution for systems

Khan Academy
1220
04:20