Keystones — Lintel
Five GCSE retrieval questions · 19 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 850,000 in standard form
Answer: 8.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 27.77cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 4:9:3. What fraction of the counters are purple?
Answer: 9⁄16 -
5. Statistics Mean
Calculate the mean of: 5, 43, 14, 19, 12, 39, 39. Give your answer to 2 decimal places
Answer: 24.43