Math mastery through
deliberate reps.

Free math practice in a dojo built for doing the problems — from arithmetic through college, with Mastery Score goals, method guides, and explanations when you miss.

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Browse K–12Browse CollegeBrowse Exam prep

Free · no account needed · 187 skills and counting

187skills
13courses
6belt ranks
$0no account needed

How it works

Three steps from pick to mastery — no worksheet roulette.

  1. 01Pick a skillChoose a course, open a skill, and start at your level — no placement test required.
  2. 02Drill with feedbackCheck answers instantly; miss and get a method-first explanation.
  3. 03Climb your Mastery ScoreStreaks raise your score toward 100; mistakes cost more near the top.

Real problems, not placeholders

A spread pulled straight from the question bank — arithmetic through differential equations, rendered exactly like it looks in practice.

Integer Addition

35+(−6)35 + (-6)

Quadratic Roots (Factoring)

Find the roots. Enter as a, b with a ≤ b.

x2−1x−30=0x^2-1x-30=0

Right-Triangle Diagram

Find the missing leg in the right triangle. (Figure not drawn to scale — use the labeled side lengths, not their pixel lengths.)

Right-Triangle Trig

Find sin θ for the right triangle with the sides shown.

opp=15,  adj=8,  hyp=17\text{opp}=15,\;\text{adj}=8,\;\text{hyp}=17

Power Rule Derivatives

Differentiate. Enter like 12x^3 or 5x.

f(x)=5x5f(x) = 5x^{5}

Separable ODEs (Setup)

Separate variables for dy/dx = 2x/y. Enter like: dy/y = x dx

dydx=2xy\frac{dy}{dx} = \frac{2x}{y}

K–12

Foundations through precalculus — build fluency by drilling.

foundations21 skills

Arithmetic

Build speed and accuracy with the operations everything else rests on.

foundations14 skills

Pre-Algebra

Fractions, ratios, percents, and the language of variables.

intermediate36 skills

Algebra

Equations, factoring, and the habits of algebraic thinking.

intermediate19 skills

Geometry

Angles, area, and spatial reasoning with precise calculation.

intermediate13 skills

Trigonometry

Right triangles, the unit circle, and the core trig toolkit.

advanced16 skills

Precalculus

Advanced algebra and trig as the bridge into calculus.

College

Calculus, multivariable, linear algebra, and differential equations.

intermediate29 skills

Calculus

Limits, derivatives, and integrals — practiced until automatic.

advanced12 skills

Multivariable Calculus

Partial derivatives, gradients, and higher-dimensional technique.

intermediate16 skills

Linear Algebra

Matrices, determinants, and linear systems by hand.

advanced11 skills

Differential Equations

First-order methods and the models Diff EQ is built for.

Exam prep

Curated skill folders for GED, SAT, and ACT math — deliberate reps on the underlying skills, not full timed exams.

foundations46 skills

GED Math Prep

Skill drills that show up on GED-style math — not a full practice test. Build fluency on numbers, fractions, percents, and linear basics.

intermediate68 skills

SAT Math Prep

Core algebra, functions, and geometry skills useful for SAT Math. These are deliberate reps, not timed multi-paragraph exam clones.

intermediate85 skills

ACT Math Prep

Algebra through trig skills that power ACT Math. Drill the underlying techniques — not official ACT wording or timed sections.

Earn belts as you master skills

Every course has its own ladder — clear a coverage and score bar to rank up, white through black.

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