Keystones — Lintel
Five GCSE retrieval questions · 25 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 520,000,000 in standard form
Answer: 5.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x - 11
Answer: (x + 11)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.77cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 10:11. What fraction of the counters are red?
Answer: 10⁄21 -
5. Statistics Mean
Calculate the mean of: 37, 38, 38, 46, 39, 48, 32. Give your answer to 2 decimal places
Answer: 39.71