Keystones — Lintel
Five GCSE retrieval questions · 13 February 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 6968 to 2 significant figures
Answer: 7000 -
2. Algebra Linear nth term
Determine the nth term rule: 4, 10, 16, 22, 28, ...
Answer: 6n + -2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 79°
Answer: 233.6cm² -
4. Ratio Unitary method
If 8 items cost £31.30, how many items can you buy for £50.10?
Answer: 12.8 items -
5. Statistics Mode
What are the modes of: 31, 31, 13, 20, 31, 13
Answer: 13 and 31