Keystones — Lintel
Five GCSE retrieval questions · 31 March 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 39.772 to 3 significant figures
Answer: 39.8 -
2. Algebra Linear nth term
Determine the nth term rule: -1, 6, 13, 20, 27, ...
Answer: 7n + -8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 30cm, angle = 72°
Answer: 214cm² -
4. Ratio Unitary method
6 kg costs £40.40. What is the cost of 16 kg?
Answer: £107.73 -
5. Statistics Mode
What are the modes of: 15, 33, 33, 15, 30, 18
Answer: 15 and 33