FoF
FoF

Education

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Interactive tools for practicing core skills, seeing progress clearly, and giving kids the next right challenge.

Learning path

From tally marks to how a computer adds

See every idea in order, which applet or book teaches it, and how far you have come on this device or account.

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  1. Tally marks
  2. Place value
  3. Adding and subtracting
  4. Multiplying
  5. Division and fractions
  6. Binary
  7. Logic gates and adders
  8. Universality (BOI)
  9. Algebra (Feynman 22)

MathFlu

Practice and assessment modes for arithmetic fluency. Works as a guest, and saves online with an account.

Use on this device without an account →

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Counting Creatures

A number-sense applet for seeing counting systems through humans, sloths, and computers.
Access older versions
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Logic Gates

A hands-on path from switches and gates to a working binary adder.
Access older versions
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Zip and the Thinking MachinesNew

A picture book about brains, computer chips, and how AI learns by guessing and correcting.
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Pipa’s Code QuestNew

A chapter book about building software with an AI coding agent: save points, branches, and the builder loop.
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