Keystones — Lintel
Five GCSE retrieval questions · 5 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 840,000,000 in standard form
Answer: 8.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 15.07cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 13:14. What fraction of the counters are purple?
Answer: 14⁄27 -
5. Statistics Mean
Calculate the mean of: 40, 29, 40, 15, 6, 10, 42, 36
Answer: 27.25