Keystones — Lintel
Five GCSE retrieval questions · 10 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 42,000,000 in standard form
Answer: 4.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.18cm -
4. Ratio Mixed ratio problems
Express the first part of 15:12 as a fraction in simplest form
Answer: 5⁄9 -
5. Statistics Mean
Calculate the mean of: 6, 17, 10, 21, 22, 33. Give your answer to 2 decimal places
Answer: 18.17