Keystones — Lintel
Five GCSE retrieval questions · 25 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 22.537 to 3 significant figures
Answer: 22.5 -
2. Algebra Linear nth term
Determine the nth term rule: -1, 2, 5, 8, 11, ...
Answer: 3n + -4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 68°
Answer: 211.4cm² -
4. Ratio Unitary method
If 7 items cost £39.50, how many items can you buy for £38.50?
Answer: 6.8 items -
5. Statistics Mode
What are the modes of: 33, 27, 12, 33, 21, 12
Answer: 12 and 33