Keystones — Lintel
Five GCSE retrieval questions · 18 October 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 2397 to 2 significant figures
Answer: 2400 -
2. Algebra Linear nth term
Find the nth term: 26, 21, 16, 11, ...
Answer: 31 - 5n -
3. Geometry Area using ½ab sin C
Calculate area: sides 14cm and 20cm, included angle 60°
Answer: 121.2cm² -
4. Ratio Unitary method
4 kg costs £19.40. What is the cost of 16 kg?
Answer: £77.60 -
5. Statistics Mode
Find the mode of: 48, 20, 62, 31, 76
Answer: No mode