Keystones — Lintel
Five GCSE retrieval questions · 27 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
4500000
Answer: 4.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 32°. Find opposite
Answer: 15.6cm -
4. Ratio Mixed ratio problems
Divide 147 in the ratio 3:1:3
Answer: 63, 21 and 63 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 41, 18, 19, what is the missing number?
Answer: 26