Keystones — Lintel
Five GCSE retrieval questions · 15 October 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 8785 to 2 significant figures
Answer: 8800 -
2. Algebra Linear nth term
Determine the nth term rule: -2, 3, 8, 13, 18, ...
Answer: 5n + -7 -
3. Geometry Area using ½ab sin C
Calculate area: sides 10cm and 11cm, included angle 60°
Answer: 47.6cm² -
4. Ratio Unitary method
8 kg costs £38.80. What is the cost of 25 kg?
Answer: £121.25 -
5. Statistics Mode
What are the modes of: 33, 20, 16, 20, 33, 26
Answer: 20 and 33