L072 · Allow 10–15 minutes for learners ready to move on. Answers are available after an attempt.
A similar shape has length factor 1.5. Its original area is 80 cm². Find new area.
80×1.5²=180 cm².
A learner uses a length factor of 3 to triple volume. Correct the claim.
Volume factor is 3³=27, so volume is 27 times as large.
Lesson L072: Cumulative checkpoint 5 and feedback
Objective: Choose and justify methods across earlier proportional and geometric work.
60-minute structure: 0-7 Connect & Check; 7-14 Share; 14-25 Present/model; 25-44 Apply route choice/practice; 44-52 independent exam-style check; 52-60 Recall & Review, WWW/EBI and next step.
I used my working and assessment evidence to identify the exact mathematical step that was secure and the specific misconception that needs attention.
I will correct one precise step, explain why the correction works and complete a fresh delayed question without the original scaffold.
Stretch: A similar shape has length factor 1.5. Its original area is 80 cm². Find new area.
Deep challenge: A learner uses a length factor of 3 to triple volume. Correct the claim.