Keystones — Lintel
Five GCSE retrieval questions · 12 February 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 53.596 to 3 significant figures
Answer: 53.6 -
2. Algebra Linear nth term
Find the nth term: 32, 28, 24, 20, ...
Answer: 36 - 4n -
3. Geometry Area using ½ab sin C
Calculate area: sides 20cm and 10cm, included angle 60°
Answer: 86.6cm² -
4. Ratio Unitary method
If 11 items cost £20.20, how many items can you buy for £32.80?
Answer: 17.9 items -
5. Statistics Mode
Find the mode of: 80, 62, 19, 30, 45
Answer: No mode