Keystones — Lintel
Five GCSE retrieval questions · 20 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.066 in standard form
Answer: 6.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 45°. Find opposite
Answer: 12cm -
4. Ratio Mixed ratio problems
Simplify: 6:12:9
Answer: 2:4:3 -
5. Statistics Mean
Calculate the mean of: 25, 25, 5, 5, 35, 39, 26, 46
Answer: 25.75