Doing math is life changing.✱

A daily box of problems, streaks that pay out every two weeks, and ✱ that flies into your wallet. From times tables to break-even.

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how it works

Open today's box. Ten problems, easy to hard. Solve each or toss it.
Answer right and inside par to earn ✱. It flies into your wallet.
Level up to open new courses.
Know a course cold? It rests for a while. Come back to review. That pays too.
Keep a streak. Every two straight weeks pays a bonus on what you earned, a bigger share each time, up to half. Miss a day and the streak starts over.

what you can learn

Foundations

Mental Arithmetic
Small facts · Gaps & place value · Times tables · …

Fractions, Decimals & Percents
Fraction basics · Decimals · Percents · …

Business

Business Math
First Business Story · Percentages in Business · Markup Is Not Margin · …

Accounting
The Accounting Equation · Cash In Is Not Always Revenue · Reading a P&L · …

Bookkeeping
Sorting Transactions · Invoices & Sales Tax · Journal Entries · …

Finance & Money
Money Basics · Compound Growth · Personal Finance · …

Growth & Marketing Math
Funnels · Customer Acquisition Cost · Churn & Retention · …

Business Stats & Decisions
Averages & Spread · Probability Basics · Expected Value · …

Thinking

Thinking
Orders of magnitude · Fermi estimates · Mental shortcuts · …

School math

Pre-Algebra
Negative numbers · Order of operations · Factors & primes · …

Geometry
Angles · Area & perimeter · Circles · …

Probability & Statistics
Averages · Chance basics · Spread · …

Counting & Discrete Math
Counting · Combinations · Logic & sets · …

Algebra
Linear equations · Lines & slope · Inequalities · …

Number Theory
Divisibility · Number bases · Clock arithmetic · …

Trigonometry
Right-triangle trig · Radians & the unit circle · Laws of sines & cosines · …

College & beyond

Calculus
Limits · Derivatives · Using derivatives · …

Linear Algebra
Vectors · Matrices · Inverses & rank · …

Beyond College
Complex numbers · Numerical methods · Differential equations · …

every course, with the level that opens it

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