Keystones — Lintel
Five GCSE retrieval questions · 13 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.029 in standard form
Answer: 2.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.21cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 9:9:1. What fraction of the marbles are orange?
Answer: 9⁄19 -
5. Statistics Mean
Calculate the mean of: 9, 7, 30, 23, 48, 27
Answer: 24