Keystones — Lintel
Five GCSE retrieval questions · 24 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,300,000 in standard form
Answer: 6.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
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
Orange, purple and pink marbles are in the ratio 11:12:5. What fraction of the marbles are pink?
Answer: 5⁄28 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 27, 50, 21, 43, 45, what is the missing number?
Answer: 54