Keystones — Lintel
Five GCSE retrieval questions · 7 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 870,000,000 in standard form
Answer: 8.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 56
Answer: (x - 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.95cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 9:2. What fraction of the marbles are blue?
Answer: 2⁄11 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 17, 22, 17, 23, what is the missing number?
Answer: 26