Keystones — Lintel
Five GCSE retrieval questions · 13 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00071 in standard form
Answer: 7.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.02cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:6
Answer: 3:5:2 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 48, 31, 17, what is the missing number?
Answer: 12