Keystones — Lintel
Five GCSE retrieval questions · 28 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000088 in standard form
Answer: 8.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.98cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 15:10. What fraction of the marbles are red?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 25, 31, 27, 49, 26, what is the missing number?
Answer: 46