Keystones — Lintel
Five GCSE retrieval questions · 1 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00031
Answer: 3.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 59°. Find opposite
Answer: 38.3cm -
4. Ratio Mixed ratio problems
Simplify: 16:12:24
Answer: 4:3:6 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 45, 31, 26, what is the missing number?
Answer: 38