Keystones — Lintel
Five GCSE retrieval questions · 13 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000051 in standard form
Answer: 5.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 16.78cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 11:8:1. What fraction of the counters are purple?
Answer: 2⁄5 -
5. Statistics Mean
Calculate the mean of: 23, 40, 20, 35, 39, 41, 29. Give your answer to 2 decimal places
Answer: 32.43