Keystones — Lintel
Five GCSE retrieval questions · 30 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0053 in standard form
Answer: 5.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 54
Answer: (x + 9)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 6:9:10. What fraction of the sweets are purple?
Answer: 9⁄25 -
5. Statistics Mean
Calculate the mean of: 34, 32, 20, 23, 26, 43, 32, 6
Answer: 27