Keystones — Lintel
Five GCSE retrieval questions · 6 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
230000
Answer: 2.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 41°. Find opposite
Answer: 8.7cm -
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: 20, 5, 16, 27, 48, 14
Answer: 21.7