Learn math one skill at a time. Short lessons, something to try in each one, and problems that check your answers. The map shows how every skill leads to the next.
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The whole course as a skill tree. Each lesson links to the lessons it unlocks, and lights up as you master it. Point at a lesson to trace what it builds on; click it for details.
Topics you’ve worked on come back here on a schedule, so they stick. You’ll also find drills to retry, check-ups, a placement quiz, your progress and charts, and backups.
Endless fresh problems, made up on the spot. Pick topics, try a look-alike mix that makes you work out what kind of problem it is, or race the clock in a sprint. Your streak counts problems in a row right on the first try.
Math in your head: no paper, no calculator. Each strategy is a trick for turning a hard sum into a few easy ones. Learn one at a time, then keep them sharp with a short daily workout. Say the in-between numbers to yourself. Ten minutes a day is plenty.
Every wrong answer lands here, sorted by kind of mistake. Write notes on them, retry them, mark them as fixed, or delete them. Add your own notes too. All of it is saved with your progress and in backup files.
Graph anything you can type. Use x as the input. Any other letter, like a or k, gets its own slider. Drag the graph to move around, and point at it to read values.
Examples
Table of values
Everything from the lessons on one page.