Keystones — Lintel
Five GCSE retrieval questions · 28 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0072
Answer: 7.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 25°. Find adjacent side
Answer: 19cm -
4. Ratio Mixed ratio problems
Express the first part of 6:4 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
Calculate the mean of: 16, 23, 11, 28, 8, 35, 45
Answer: 23.7