Keystones — Lintel
Five GCSE retrieval questions · 24 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000 in standard form
Answer: 2.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 48.26cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 14:4. What fraction of the marbles are purple?
Answer: 2⁄9 -
5. Statistics Mean
Calculate the mean of: 21, 15, 33, 48, 26, 13
Answer: 26