Keystones — Lintel
Five GCSE retrieval questions · 14 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0009 in standard form
Answer: 9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.27cm -
4. Ratio Mixed ratio problems
Divide 125 in the ratio 1:2:2
Answer: 25, 50 and 50 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 16, 50, 41, 42, 50, what is the missing number?
Answer: 35