Keystones — Lintel
Five GCSE retrieval questions · 26 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.016
Answer: 1.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 39°. Find opposite
Answer: 8.9cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 4:2:3
Answer: 56, 28 and 42 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 30, 46, 37, 25, 41, what is the missing number?
Answer: 7