Keystones — Lintel
Five GCSE retrieval questions · 30 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 8094 to 2 significant figures
Answer: 8100 -
2. Algebra Linear nth term
Determine the nth term rule: -5, -2, 1, 4, 7, ...
Answer: 3n + -8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 48°
Answer: 148.6cm² -
4. Ratio Unitary method
If 6 items cost £18.00, how many items can you buy for £26.90?
Answer: 9 items -
5. Statistics Mode
What are the modes of: 10, 15, 40, 40, 29, 10
Answer: 10 and 40