Keystones — Lintel
Five GCSE retrieval questions · 10 February 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 25.833 to 3 significant figures
Answer: 25.8 -
2. Algebra Linear nth term
Determine the nth term rule: -1, 6, 13, 20, 27, ...
Answer: 7n + -8 -
3. Geometry Area using ½ab sin C
Calculate area: sides 24cm and 21cm, included angle 30°
Answer: 126cm² -
4. Ratio Unitary method
If 7 items cost £23.30, how many items can you buy for £26.20?
Answer: 7.9 items -
5. Statistics Mode
What are the modes of: 32, 17, 17, 16, 32, 34
Answer: 17 and 32