Keystones — Lintel
Five GCSE retrieval questions · 28 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0047 in standard form
Answer: 4.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.09cm -
4. Ratio Mixed ratio problems
Simplify: 20:16:8
Answer: 5:4:2 -
5. Statistics Mean
Calculate the mean of: 39, 39, 42, 30, 45, 20, 17, 23. Give your answer to 2 decimal places
Answer: 31.88