Keystones — Lintel
Five GCSE retrieval questions · 28 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 630,000 in standard form
Answer: 6.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 20.8cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 11:12. What fraction of the counters are purple?
Answer: 12⁄23 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 42, 20, 22, 36, what is the missing number?
Answer: 30