Keystones — Lintel
Five GCSE retrieval questions · 19 May 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 39.209 to 3 significant figures
Answer: 39.2 -
2. Algebra Linear nth term
Determine the nth term rule: 1, 5, 9, 13, 17, ...
Answer: 4n + -3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 76°
Answer: 314.4cm² -
4. Ratio Unitary method
7 kg costs £38.20. What is the cost of 23 kg?
Answer: £125.51 -
5. Statistics Mode
Find the mode of: 48, 17, 57, 35, 76
Answer: No mode