Objective
Choose and justify methods across earlier proportional and geometric work.
Calculator: Non-calculator core; calculator optional only for checking where labelled.

Recall
Retrieve the key fact or method needed for cumulative checkpoint 5 and feedback.
Core practice
A similar shape has length factor 1.5. Its original area is 80 cm². Find new area.
Reasoning
A learner uses a length factor of 3 to triple volume. Correct the claim.
Exam-style
Solve an exam-style problem involving cumulative checkpoint 5 and feedback. Show working, include a check and interpret your answer.