Keystones — Lintel
Five GCSE retrieval questions · 28 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00052 in standard form
Answer: 5.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.23cm -
4. Ratio Mixed ratio problems
Simplify: 16:8:24
Answer: 2:1:3 -
5. Statistics Mean
Calculate the mean of: 9, 35, 41, 24, 15, 10, 8, 49. Give your answer to 2 decimal places
Answer: 23.88