Keystones — Lintel
Five GCSE retrieval questions · 16 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,200,000 in standard form
Answer: 9.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.52cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 9:15. What fraction of the counters are black?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 33, 45, 17, 24, 46, what is the missing number?
Answer: 9