Keystones — Lintel
Five GCSE retrieval questions · 3 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
4200000
Answer: 4.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 43°. Find opposite
Answer: 20.5cm -
4. Ratio Mixed ratio problems
Divide 176 in the ratio 4:4:3
Answer: 64, 64 and 48 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 35, 27, 41, 45, 47, what is the missing number?
Answer: -45