Keystones — Lintel
Five GCSE retrieval questions · 13 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0096
Answer: 9.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 58°. Find opposite
Answer: 35.2cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:9
Answer: 3:4:3 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 36, 45, 26, what is the missing number?
Answer: 5