Keystones — Lintel
Five GCSE retrieval questions · 15 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000017 in standard form
Answer: 1.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.05cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 11:15. What fraction of the marbles are white?
Answer: 15⁄26 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 44, 19, 26, 42, what is the missing number?
Answer: 54