Keystones — Lintel
Five GCSE retrieval questions · 5 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.015 in standard form
Answer: 1.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 15.53cm -
4. Ratio Mixed ratio problems
In ratio 2:8:12, what fraction is the first part?
Answer: 1⁄11 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 40, 21, 49, 38, what is the missing number?
Answer: 27