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Course details

Mathematics

The four operations from absolute zero — counting, then addition and subtraction, then multiplication and division — each one taught as an idea first, with a diagram you move yourself, and then as a shortcut that makes big numbers manageable. No code, no editor: just the mathematics, and the techniques that make it fast.

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Course curriculum

Addition & Subtraction5 lessons

Addition and subtraction start as counting — forward, and backward — then gain a single fast habit, completing the ten, that turns any two-number sum into one you can do in your head, however large the numbers get.

  1. Addition & Subtraction — Counting On, and Completing the Ten20 min
  2. Completing the Ten, at Any Scale — and Compensation18 min
  3. Column Addition — When Mental Math Runs Out19 min
  4. Column Subtraction — Borrowing, the Other Way18 min
  5. Capstone — Choosing Your Tool16 min