Keystones — Lintel
Five GCSE retrieval questions · 24 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.057
Answer: 5.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 35°. Find opposite
Answer: 16.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 20, 45, 28, what is the missing number?
Answer: -13