Keystones — Lintel
Five GCSE retrieval questions · 9 July 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 4090 to 2 significant figures
Answer: 4100 -
2. Algebra Linear nth term
Determine the nth term rule: 2, 7, 12, 17, 22, ...
Answer: 5n + -3 -
3. Geometry Area using ½ab sin C
Calculate area: sides 11cm and 12cm, included angle 30°
Answer: 33cm² -
4. Ratio Unitary method
If 9 items cost £18.00, how many items can you buy for £45.40?
Answer: 22.7 items -
5. Statistics Mode
Find the mode of: 63, 76, 45, 34, 13
Answer: No mode