Keystones — Lintel
Five GCSE retrieval questions · 10 July 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 5387 to 2 significant figures
Answer: 5400 -
2. Algebra Linear nth term
Determine the nth term rule: 3, 9, 15, 21, 27, ...
Answer: 6n + -3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 74°
Answer: 143.7cm² -
4. Ratio Unitary method
If 9 items cost £27.50, how many items can you buy for £45.80?
Answer: 15 items -
5. Statistics Mode
Find the mode of: 42, 33, 17, 76, 55
Answer: No mode