Keystones — Lintel
Five GCSE retrieval questions · 18 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 200,000 in standard form
Answer: 2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.39cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 2:12. What fraction of the counters are white?
Answer: 6⁄7 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 35, 33, 26, 32, what is the missing number?
Answer: 29