Keystones — Lintel
Five GCSE retrieval questions · 15 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.002 in standard form
Answer: 2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.4cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 4:8:2. What fraction of the marbles are purple?
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 22, 8, 33, 38, 35, 44
Answer: 30