Keystones — Lintel
Five GCSE retrieval questions · 20 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 730,000 in standard form
Answer: 7.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 8.75cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 11:3. What fraction of the counters are purple?
Answer: 3⁄14 -
5. Statistics Mean
Calculate the mean of: 32, 19, 45, 28, 7, 46
Answer: 29.5