Times tables to mastery
Fifty-five canonical facts — commutativity means nothing is learned twice — in the order school teaches them: 2, 10, 5, 3, 4, 6, 7, 8, 9. A fact counts as known only after several correct answers spaced out over time.
- A three-state map: to learn, in progress, known
- The answer is typed on a keypad, not picked from four
- A new fact is shown as an array of objects first, then recalled
- Fluency is measured silently: no timer on screen