wunder betaMath Classes for Teens
25 free math classes for teens (Ages 13–17) on Wunder — short, fact-checked courses and lessons with narration and a quiz. Filter by age — each link is its own page, not a JavaScript toggle.
📐
Working with Angles
Name angles, measure them with a protractor, and use powerful angle facts — straight lines, points, and crossing lines — to hunt down missing angles.
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Trigonometry Basics
Unlock the link between angles and sides in right triangles. Learn SOH-CAH-TOA and use sine, cosine, and tangent to work with the sides you can't reach.
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Translations, Rotations, and Reflections
Master the three rigid transformations — slide a shape, flip it, and turn it — and describe each move precisely on the coordinate grid.
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The Pythagorean Theorem
In every right triangle, a² + b² = c². Discover this 2,500-year-old rule, use it to find missing sides, and spot the famous 3-4-5 triangle everywhere.
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Similar Shapes and Scale Factors
Similar shapes share the same shape but come in different sizes. Learn how the scale factor links them and use it to find missing lengths on maps, models, and enlargements.
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Polygon Angles, Area, and Volume
Add up the angles inside any polygon, measure the area of flat shapes, and calculate the volume of solids — three powerful geometry tools in one course.
🧊
Faces, Edges, and Cross-Sections of 3D Shapes
Count the faces, edges, and vertices of solids like cubes and pyramids — then slice them open to reveal the 2D cross-sections hiding inside.
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Congruence, Parallel Lines, and Constructions
Prove two shapes are identical with congruence rules, unlock the angle facts hidden in parallel lines, and build perfect shapes with a compass and straightedge.
⭕
Circumference and Area of Circles
Meet pi, the number hidden in every circle, and use it to measure the distance around a circle (C = πd) and the space inside it (A = πr²).
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Scatter Plots and Correlation
Plot two variables against each other, name the correlation as positive, negative, or none, and draw a line of best fit to make honest predictions.
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Graphing Equations
See how linear equations draw straight lines — and what slope and y-intercept really mean — then meet the U-shaped curves that quadratics make.
❌
Systems of Equations
Two equations, one answer that satisfies both. See why the point where two lines cross solves both equations at once, and read solutions from a graph.
🧮
Rearranging Formulas
Make any variable the subject. Use inverse operations to rearrange formulas until the letter you actually want stands alone.
✖️
Multiplying Binomials
Expand products like (x + 3)(x − 2) using the grid method or FOIL, then collect like terms to land on a clean quadratic expression.
🔢
Finding the Nth Term
Crack the formula behind any arithmetic sequence. Once you can write rules like 4n − 1, you can name the 100th term without listing the 99 before it.
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Estimating Answers from Graphs
Read approximate values straight off plotted lines and curves — find outputs for given inputs and spot where a graph crosses an axis to estimate solutions.
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Cryptography: The Math of Secrets
The math behind secret messages — from ciphers you can crack by hand to the public-key trick that quietly protects everything you do online.
🚀
Start a Business
Turn an idea into a real business the smart, lean way.
💳
Money Skills for Teens
Budgeting, saving, and compound interest: money skills to start now.
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Intro to Economics
Scarcity, supply and demand, and the forces that shape every economy.
🎲
Probability
Measure chance with confidence: from coin flips to conditional reasoning.
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Statistics Basics
Turn raw data into insight: averages, spread, sampling, and correlation.
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Geometry
Angles, triangles, circles, and proof: how shapes reveal hidden truths.
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Algebra Essentials
Solve equations, graph lines, and crack quadratics: the core of algebra.
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Pre-Algebra
Master the bridge from arithmetic to algebra: integers, order, and variables.
All Math courses (topic hub)
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