Keystones — Lintel
Five GCSE retrieval questions · 5 April 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 78.218 to 3 significant figures
Answer: 78.2 -
2. Algebra Linear nth term
Determine the nth term rule: -4, 1, 6, 11, 16, ...
Answer: 5n + -9 -
3. Geometry Area using ½ab sin C
Calculate area: sides 10cm and 11cm, included angle 30°
Answer: 27.5cm² -
4. Ratio Unitary method
9 kg costs £13.30. What is the cost of 17 kg?
Answer: £25.12 -
5. Statistics Mode
Find the mode of: 44, 28, 61, 78, 19
Answer: No mode