Math is Fun! | Free High School Math Lessons

High School Math Lessons

Explore our comprehensive library of math lessons designed for high school students.

Algebra I & II

Grades 9-10

Master equations, polynomials, functions, and more.

Geometry

Grades 9-10

Learn about shapes, angles, proofs, and spatial reasoning.

Trigonometry

Grades 10-11

Explore sine, cosine, tangent, and trigonometric identities.

Pre-Calculus

Grade 11

Build foundations for calculus with functions and limits.

Calculus

Grade 12

Discover derivatives, integrals, and rates of change.

Statistics

Grades 11-12

Analyze data, probability, and statistical methods.

Sample Lesson: Solving Linear Equations

Linear equations are one of the foundational concepts in algebra.

ax + b = c

Example: Solve for x: 3x + 7 = 22

Step 1: Subtract 7 from both sides
3x = 15

Step 2: Divide both sides by 3
x = 5

Sample Lesson: Area of a Circle

A = πr²

Example: Find the area of a circle with radius 5 cm

A = π × 5² = 25π ≈ 78.54 cm²

About Math is Fun!

Math is Fun! is a free K-12 educational resource for high school mathematics.

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We provide comprehensive lessons in Algebra, Geometry, Trigonometry, Pre-Calculus, Calculus, and Statistics aligned with Common Core State Standards.

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Last Updated: October 2025

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Math is Fun! aligns with Common Core State Standards for Mathematics.

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