Keystones — Lintel
Five GCSE retrieval questions · 24 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0084
Answer: 8.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 35°. Find opposite
Answer: 18.2cm -
4. Ratio Mixed ratio problems
Express the first part of 5:4 as a fraction in simplest form
Answer: 5⁄9 -
5. Statistics Mean
Calculate the mean of: 39, 20, 49, 30, 8, 44, 31, 13
Answer: 29.3