Keystones — Lintel
Five GCSE retrieval questions · 2 April 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 88.765 to 3 significant figures
Answer: 88.8 -
2. Algebra Linear nth term
Determine the nth term rule: -2, 4, 10, 16, 22, ...
Answer: 6n + -8 -
3. Geometry Area using ½ab sin C
Calculate area: sides 19cm and 22cm, included angle 60°
Answer: 181cm² -
4. Ratio Unitary method
If 9 items cost £28.20, how many items can you buy for £36.20?
Answer: 11.6 items -
5. Statistics Mode
What are the modes of: 34, 11, 25, 27, 11, 34
Answer: 11 and 34