Keystones — Lintel
Five GCSE retrieval questions · 14 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 73,000 in standard form
Answer: 7.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.73cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 850 ml
Answer: 80:17 -
5. Statistics Mean
Calculate the mean of: 50, 7, 7, 31, 41, 49, 33, 33. Give your answer to 2 decimal places
Answer: 31.38