Keystones — Lintel
Five GCSE retrieval questions · 13 October 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 19.467 to 3 significant figures
Answer: 19.5 -
2. Algebra Linear nth term
Find the nth term: 14, 8, 2, -4, ...
Answer: 20 - 6n -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 16cm, angle = 76°
Answer: 108.7cm² -
4. Ratio Unitary method
If 7 items cost £17.20, how many items can you buy for £28.30?
Answer: 11.5 items -
5. Statistics Mode
What are the modes of: 29, 20, 37, 15, 37, 15
Answer: 15 and 37