Keystones — Lintel
Five GCSE retrieval questions · 25 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
510000
Answer: 5.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 39°. Find adjacent side
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 9, 24, 31, 13, 49, 12, 5
Answer: 20.4