Keystones — Lintel
Five GCSE retrieval questions · 14 February 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 8618 to 2 significant figures
Answer: 8600 -
2. Algebra Linear nth term
Determine the nth term rule: 0, 6, 12, 18, 24, ...
Answer: 6n + -6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 53°
Answer: 89.8cm² -
4. Ratio Unitary method
10 kg costs £26.40. What is the cost of 15 kg?
Answer: £39.60 -
5. Statistics Mode
Find the mode of: 62, 30, 74, 17, 49
Answer: No mode