Keystones — Lintel
Five GCSE retrieval questions · 1 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
99000000
Answer: 9.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 41°. Find opposite
Answer: 17.4cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 8, 16, 20, 37, 45, 45, 39
Answer: 30