- Idea: "equal" is something you should SEE, not something you are told
- The technique is taught first: cut it finer, same amount — times the top and bottom by the same number
- The teach screen lets you cut a bar ×2 ×3 ×4 and see for yourself that it stays the same length
- The wrong answers are the mistakes children really make, not random fractions
- The main trap — adding to both instead of multiplying — is on every single board
- A wrong pick gets no cross — the beam just tips and shows you which is heavier
- Every fraction carries its own bar, and the two can be laid together at any time
- Four levels, including running the rule backwards to simplify
- verify:fractions proves all 240 boards in whole-number arithmetic — never decimals
- Two misses → the bars appear on their own; four → a breath. Never a game-over
- A harder mode: type the missing number instead of choosing from fourplanned
- Follow on to adding fractions, using the same rule to find a common bottomplanned
✓ = done · ☐ = planned. Every game is built one step at a time like this.