C-first · Display ledge diagram

Id

C-first

Title

Display ledge diagram

Source kind

Original supplied fiction; provider knowledge is separately attributed. No actual child/local trial or reader success supplied.

Complete neutral source

Complete original fictional display-ledge diagram account. Drawn labelled bases M and N use a printed centimetre scale from zero with equal1cm intervals. M spans0–3cm; N spans0–5cm. Those are supplied diagram readings, not dimensions of real rocks or the child’s own ruler measurements. The diagram records no prior prediction. Its display-reader job is to compare these two drawn bases accurately. A separate new plain-paper measuring plan could ask which chosen paper base is longer, use a familiar centimetre ruler with zero aligned and the same base direction, and keep an actual prediction before its own measurement. No new paper result is supplied.

Exact four prompts

• Compare the two supplied drawn base lengths with their unit and a real-object limit.
• Is a before-measurement prediction supplied here? Explain using the account.
• Make two matching record rows for M and N with supplied base length and source/unit.
• With guidance, propose one suitable ruler-reading step for the separate new paper plan and keep its result open.