Keystones — Lintel
Five GCSE retrieval questions · 26 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 390,000,000 in standard form
Answer: 3.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 24
Answer: (x - 2)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.94cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 15:10. What fraction of the counters are white?
Answer: 2⁄5 -
5. Statistics Mean
Calculate the mean of: 50, 19, 39, 14, 34, 28. Give your answer to 2 decimal places
Answer: 30.67