Keystones — Lintel
Five GCSE retrieval questions · 4 April 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 5870 to 2 significant figures
Answer: 5900 -
2. Algebra Linear nth term
Find the nth term: 31, 28, 25, 22, ...
Answer: 34 - 3n -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 67°
Answer: 207.cm² -
4. Ratio Unitary method
8 kg costs £23.50. What is the cost of 25 kg?
Answer: £73.44 -
5. Statistics Mode
What are the modes of: 17, 20, 27, 17, 35, 35
Answer: 17 and 35