Keystones — Lintel
Five GCSE retrieval questions · 15 February 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 89.932 to 3 significant figures
Answer: 89.9 -
2. Algebra Linear nth term
Find the nth term: 17, 12, 7, 2, ...
Answer: 22 - 5n -
3. Geometry Area using ½ab sin C
Calculate area: sides 17cm and 18cm, included angle 60°
Answer: 132.5cm² -
4. Ratio Unitary method
8 kg costs £34.40. What is the cost of 17 kg?
Answer: £73.10 -
5. Statistics Mode
What are the modes of: 16, 12, 26, 12, 32, 32
Answer: 12 and 32