Keystones — Lintel
Five GCSE retrieval questions · 1 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.075 in standard form
Answer: 7.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 60°. Find adjacent side
Answer: 15.5cm -
4. Ratio Mixed ratio problems
Express the first part of 13:9 as a fraction in simplest form
Answer: 13⁄22 -
5. Statistics Mean
Calculate the mean of: 38, 25, 36, 37, 42, 14, 16. Give your answer to 2 decimal places
Answer: 29.71