Keystones — Lintel
Five GCSE retrieval questions · 23 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.055 in standard form
Answer: 5.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 44
Answer: (x - 4)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 18.63cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 15:11. What fraction of the counters are orange?
Answer: 15⁄26 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 39, 20, 31, what is the missing number?
Answer: 70