Keystones — Lintel
Five GCSE retrieval questions · 1 April 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 5528 to 2 significant figures
Answer: 5500 -
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
Find area of triangle: a = 20cm, b = 13cm, angle = 51°
Answer: 101cm² -
4. Ratio Unitary method
If 11 items cost £31.50, how many items can you buy for £26.20?
Answer: 9.1 items -
5. Statistics Mode
What are the modes of: 34, 34, 16, 12, 12, 27
Answer: 12 and 34