Keystones — Lintel
Five GCSE retrieval questions · 28 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 420,000,000 in standard form
Answer: 4.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 96
Answer: (x - 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.22cm -
4. Ratio Mixed ratio problems
In ratio 1:2:5, what fraction is the first part?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 16, 23, 41, 15, what is the missing number?
Answer: 55