Keystones — Lintel
Five GCSE retrieval questions · 6 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0043
Answer: 4.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 36°. Find opposite
Answer: 21.cm -
4. Ratio Mixed ratio problems
Express the first part of 2:6 as a fraction in simplest form
Answer: 1⁄4 -
5. Statistics Mean
Calculate the mean of: 10, 50, 30, 24, 16, 37, 28
Answer: 27.9