Three steps, always in this order
Mayéutica separates logic, learning and mathematics. First the student makes a decision without numbers. Then a short verified fact appears. Only at the end does the original exercise return and calculation begin.
Ask backwards
If the student gets stuck, the system does not complete the calculation. It steps backwards until it reaches something the student can solve, then climbs again. Rescue steps may reach primary-school concepts.
The result stays outside
The valid answer space excludes the final result. The rule belongs to the task criteria.