Keystones — Lintel
Five GCSE retrieval questions · 19 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 520,000,000 in standard form
Answer: 5.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.66cm -
4. Ratio Mixed ratio problems
Simplify: 8:8:16
Answer: 1:1:2 -
5. Statistics Mean
Calculate the mean of: 17, 47, 15, 21, 42, 10, 9, 43
Answer: 25.5