Teacher copy: This page may include teaching prompts or answer keys. Answer keys in this public library can be viewed by anyone. Give learners a clean prompt, use checks as formative evidence, and change a case locally when prior access matters.
Success: independently find factor pairs and interpret a remainder for a new grouping problem. Prepare 42-card assessment. (AC9M5N02, AC9M5N09)
Set task · 2 min. Explain that values are new and the goal is reasoning; allow arrays, number facts or text.
Read card · 4 min. Present 42 cards and 7 trays; do not point out the solution. Clarify that cards stay whole.
Plan · 5 min. Learners select an array, multiplication fact family or systematic factor list.
Independent response · 7 min. Answer all items, including a sentence about a five-tray plan. Record supports.
Reasonableness check · 4 min. Learners multiply back and check whether their plan uses all 42 cards.
Exit · 3 min. “What new information would you need to choose the cheapest plan?” Key: actual tray costs and availability, possibly reuse/waste conditions. See key.