Keystones — Lintel
Five GCSE retrieval questions · 24 May 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 86.184 to 3 significant figures
Answer: 86.2 -
2. Algebra Linear nth term
Determine the nth term rule: -2, 4, 10, 16, 22, ...
Answer: 6n + -8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 72°
Answer: 179.7cm² -
4. Ratio Unitary method
If 5 items cost £34.40, how many items can you buy for £56.40?
Answer: 8.2 items -
5. Statistics Mode
Find the mode of: 64, 74, 40, 27, 17
Answer: No mode