Keystones — Lintel
Five GCSE retrieval questions · 13 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 280,000,000 in standard form
Answer: 2.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.25cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 11:3. What fraction of the marbles are white?
Answer: 3⁄14 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 34, 34, 29, 18, 27, what is the missing number?
Answer: 50