Keystones — Lintel
Five GCSE retrieval questions · 9 February 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 82.287 to 3 significant figures
Answer: 82.3 -
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 = 29cm, b = 20cm, angle = 76°
Answer: 281.4cm² -
4. Ratio Unitary method
If 11 items cost £21.60, how many items can you buy for £20.50?
Answer: 10.4 items -
5. Statistics Mode
What are the modes of: 18, 37, 15, 30, 18, 37
Answer: 18 and 37