Check one possible prerequisite at a time
Break the task into two or three skills that could have caused the error. Give yourself a tiny question for each plausible skill. If you can explain and apply one independently, move to the next. Stop when you find a step you cannot complete or explain.
Use one explanation, one example and one attempt
Find the relevant definition or example in your materials and save the page or timestamp. Write the rule in one line, follow one short example, then solve a similar item without looking. Keep a bookmark at the original task so the mini lesson has a clear endpoint.
Return to the parent task and retest the blocked step
Resume where you stopped or solve a nearby variation. If the same step still fails, write down what support you needed and revisit it later. If you get past it independently, finish the original task and keep a short reminder for the next session.
Worked example
A learner can loop over a list but cannot count its even values. First check what 7 modulo 2 returns and why. If that fails, revisit the remainder definition and try one even and one odd example. If it succeeds, inspect how a counter changes. Then return to the list exercise and count even values in a different list.
Before you finish
- Use a tiny question to verify where the problem starts.
- Link the repair to one original explanation.
- Return to the parent exercise and try the step independently.