Keystones — Lintel
Five GCSE retrieval questions · 14 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,900,000 in standard form
Answer: 5.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.26cm -
4. Ratio Mixed ratio problems
Divide 72 in the ratio 3:1:2
Answer: 36, 12 and 24 -
5. Statistics Mean
Calculate the mean of: 25, 23, 13, 31, 45, 39, 31. Give your answer to 2 decimal places
Answer: 29.57