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.
Invite: How will the same instructions process a new batch?
Encounter/model: Pretend telescope tokens: SET0; FOR EACH[ADD input]; SHOW on[1,2] gives3, and[1,5] gives6. The input source must be inside the loop.
Own practical action: Enter own fictional ordered records, make FOR EACH and choose ADD current input; predict, run and inspect each input’s contribution. Change one record and compare a new trace.
Observe/check: Point to one input and the total immediately before/after its ADD; who created and entered the block?
Possible misconception: Using a constant ADD while expecting it to read each record.
Next teaching move: Contrast ADD1 with ADD input for unequal records.
Use: choose one route, one model or neither where unnecessary. No30-route log or all-context quota. Home/extra 3 is an independent free offer, not required catch-up.