Keystones — Lintel
Five GCSE retrieval questions · 18 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.97cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 15:2. What fraction of the counters are orange?
Answer: 15⁄17 -
5. Statistics Mean
Calculate the mean of: 5, 49, 41, 32, 34, 47, 14, 45. Give your answer to 2 decimal places
Answer: 33.38