Keystones — Lintel
Five GCSE retrieval questions · 4 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 73,000,000 in standard form
Answer: 7.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.79cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m : 65cm
Answer: 140:13 -
5. Statistics Mean
Calculate the mean of: 7, 25, 31, 21, 38, 30. Give your answer to 2 decimal places
Answer: 25.33