Keystones — Lintel
Five GCSE retrieval questions · 3 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0018 in standard form
Answer: 1.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 72
Answer: (x - 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.86cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 2:5. What fraction of the marbles are black?
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 9, 26, 39, 33, 28, 25, 18. Give your answer to 2 decimal places
Answer: 25.43