Keystones — Lintel
Five GCSE retrieval questions · 27 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 610,000,000 in standard form
Answer: 6.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 33.34cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 6:5. What fraction of the counters are orange?
Answer: 6⁄11 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 45, 42, 30, what is the missing number?
Answer: 15