Keystones — Lintel
Five GCSE retrieval questions · 23 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
92000
Answer: 9.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 53°. Find opposite
Answer: 38.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 19, 43, 19, what is the missing number?
Answer: 51