Keystones — Lintel
Five GCSE retrieval questions · 11 February 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 2319 to 2 significant figures
Answer: 2300 -
2. Algebra Linear nth term
Find the nth term: 31, 27, 23, 19, ...
Answer: 35 - 4n -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 22cm, angle = 51°
Answer: 128.2cm² -
4. Ratio Unitary method
If 9 items cost £25.40, how many items can you buy for £51.20?
Answer: 18.1 items -
5. Statistics Mode
Find the mode of: 31, 50, 71, 12, 65
Answer: No mode