Keystones — Lintel
Five GCSE retrieval questions · 11 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0018 in standard form
Answer: 1.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 24.31cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 4:13. What fraction of the marbles are purple?
Answer: 13⁄17 -
5. Statistics Mean
Calculate the mean of: 45, 22, 17, 11, 14, 41, 39, 21
Answer: 26.25