Keystones — Lintel
Five GCSE retrieval questions · 25 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 450,000,000 in standard form
Answer: 4.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.19cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 12:10:2. What fraction of the marbles are red?
Answer: 1⁄2 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 35, 20, 32, 20, 49, what is the missing number?
Answer: 18