Keystones — Lintel
Five GCSE retrieval questions · 22 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 86,000,000 in standard form
Answer: 8.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 24
Answer: (x + 12)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.3cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 12:15. What fraction of the marbles are purple?
Answer: 5⁄9 -
5. Statistics Mean
Calculate the mean of: 38, 28, 24, 45, 13, 18, 27. Give your answer to 2 decimal places
Answer: 27.57