Keystones — Lintel
Five GCSE retrieval questions · 9 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 400,000 in standard form
Answer: 4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.59cm -
4. Ratio Mixed ratio problems
Simplify the ratio £4 : 85p
Answer: 80:17 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 27, 21, 44, 48, what is the missing number?
Answer: 50