Case study·Hard exam skill (4/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A peer-review card for Cones, Spheres, Hemispheres and Pyramids says: "The answer may be right, but the reasoning is incomplete."
Total: 4 marks
(a) Name the missing mathematical idea. (1 mark)
(b) Write the correct first move. (1 mark)
(c) Explain why the common trap would lose marks. (2 marks)
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