Keystones — Lintel
Five GCSE retrieval questions · 16 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
16000000
Answer: 1.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 50°. Find opposite
Answer: 31cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
Calculate the mean of: 15, 13, 7, 28, 27, 47, 47, 9
Answer: 24.1