Keystones — Lintel
Five GCSE retrieval questions · 30 March 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 6885 to 2 significant figures
Answer: 6900 -
2. Algebra Linear nth term
Find the nth term: 31, 27, 23, 19, ...
Answer: 35 - 4n -
3. Geometry Area using ½ab sin C
Calculate area: sides 25cm and 24cm, included angle 30°
Answer: 150cm² -
4. Ratio Unitary method
5 kg costs £46.50. What is the cost of 22 kg?
Answer: £204.60 -
5. Statistics Mode
Find the mode of: 50, 19, 76, 55, 25
Answer: No mode