Target/codes: name/represent/order selected numerals 0–20 and justify one counted collection; AC9MFN01, AC9MFN03. Prepare: P191 eighteen broad stamp circles, 0–20 rail, explain mat.
- Notice · 3 min. Introduce an invented archive-stamp sheet. Ask what an empty frame means; it shows zero stamps, not an unseen stamp.
- Model · 4 min. Move three of the eighteen source circles to a DONE row and pair each with one count mark. Stop well before the full answer.
- Guide · 5 min. Child counts all eighteen once, locates numeral 18 on the rail, and checks 17 comes before and 19 after. Adult may move only as directed.
- Independent route · 7 min. Day 191 A/B/C all show the eighteen-to-18 match and teach a paper visitor a trackable method. Child may show zero in an empty frame and 20 at the rail end; do not claim full range fluency from this.
- Reason check · 4 min. Offer a false card “19 in this sheet”. Ask which source mark it would need; recount the unchanged eighteen before revising the card.
- Exit · 2 min. Record the child's own method and any prompt. If count order drifts, next use a shorter new set with one card moved to DONE each time.