Keystones — Lintel
Five GCSE retrieval questions · 14 October 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 91.05 to 3 significant figures
Answer: 91.1 -
2. Algebra Linear nth term
Find the nth term: 32, 29, 26, 23, ...
Answer: 35 - 3n -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 62°
Answer: 247.2cm² -
4. Ratio Unitary method
10 kg costs £38.90. What is the cost of 21 kg?
Answer: £81.69 -
5. Statistics Mode
Find the mode of: 40, 31, 62, 78, 12
Answer: No mode