Keystones — Lintel
Five GCSE retrieval questions · 23 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00016 in standard form
Answer: 1.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.19cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 15:12. What fraction of the marbles are blue?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 24, 43, 17, what is the missing number?
Answer: 64