Keystones — Lintel
Five GCSE retrieval questions · 3 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 39,000,000 in standard form
Answer: 3.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.7cm -
4. Ratio Mixed ratio problems
Simplify: 16:20:24
Answer: 4:5:6 -
5. Statistics Mean
Calculate the mean of: 25, 34, 17, 36, 12, 34, 5. Give your answer to 2 decimal places
Answer: 23.29