Goal: show 9 − 2 as a change and verify by returning the removed objects. Codes: AC9MFN05, AC9MFN03. Prepare: card D, nine frame cards and a separate removed tray.
- Retrieve · 3 min. Ask child to show 6 then 4 with counters and say the resulting ten.
- Model · 5 min. Count 9 paper art frames, take away 2, count 7 left, then put 2 back and recount 9. Say the return checks the starting collection; it is not a new art event.
- Guide · 5 min. Child starts with 7, removes 1, shows 6, replaces it and checks 7. Use exact matching rather than guessing.
- Independent · 7 min. Child performs card D with new cards; expected 7 left and 9 after replacing two. Record first result before verbal help.
- Explain · 3 min. “If I kept the two removed cards in the same count row, what mistake could happen?” Expected: count them as still on the wall/model, giving nine instead of seven.
- Exit · 2 min. 8 take away 3 leaves 5. Group missed one-to-one/removal children for a fresh concrete recheck.