Codes: AC9M2N01, AC9M2N02. Goal: make at least two true groupings for one quantity and explain which form helps a task. Prepare: fictional materials-store cards, bundles, 0–1000 open number line as optional comparison support.
- Invite · 2. Say, “A pretend art store counts 284 tags. It has large packs, tens and loose tags. Must there be only one way to pack them?”
- Model · 5. Show
2H 8T 4O; open one H to make1H 18T 4O. Explain how both total 284. If the store needs many ten-packs, the second description is useful; neither is a different amount. - Guided · 6. For 407 tags, children choose a non-standard form:
3H 10T 7Oor40T 7O. Check totals. If someone offers4H 7T, ask them to show where the extra seventy came from. - Choice · 6. Choose D19-A/B/C. Require two representations and a sentence, drawing or AAC explanation of why they match. Optionally put the quantity on a 0–1000 line and identify its interval without pretending this completes
AC9M2N01. - Exit · 4. Write
530 = 5H 3T 0O = __H __T __Oafter opening one ten. Check5H 2T 10O. If a learner writes 5H 2T 1O, count the ten loose tags. - Note · 2. Record which exchange the child chose and whether their explanation referred to unchanged quantity.
Access/home/extension: Fictional stock avoids money and home-resource disclosure. Use counters, number sentences, oral explanation or tactile groups. Extension: find two different non-standard forms for 284 and prove each.