Keystones — Lintel
Five GCSE retrieval questions · 29 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0054
Answer: 5.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 32°. Find opposite
Answer: 15cm -
4. Ratio Mixed ratio problems
Divide 176 in the ratio 4:1:3
Answer: 88, 22 and 66 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 39, 34, 32, 42, 36, what is the missing number?
Answer: 21