Keystones — Lintel
Five GCSE retrieval questions · 20 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 72,000,000 in standard form
Answer: 7.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.28cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:18
Answer: 3:5:6 -
5. Statistics Mean
Calculate the mean of: 27, 35, 19, 17, 47, 32, 16, 48. Give your answer to 2 decimal places
Answer: 30.13