Keystones — Lintel
Five GCSE retrieval questions · 6 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.048 in standard form
Answer: 4.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 37.13cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 10:9:9. What fraction of the marbles are purple?
Answer: 9⁄28 -
5. Statistics Mean
Calculate the mean of: 50, 6, 14, 40, 34, 38. Give your answer to 2 decimal places
Answer: 30.33