Keystones — Lintel
Five GCSE retrieval questions · 22 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000019 in standard form
Answer: 1.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.39cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 3:10:1. What fraction of the sweets are purple?
Answer: 5⁄7 -
5. Statistics Mean
Calculate the mean of: 38, 20, 5, 10, 38, 38, 17. Give your answer to 2 decimal places
Answer: 23.71