Keystones — Lintel
Five GCSE retrieval questions · 26 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,300,000 in standard form
Answer: 9.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 64
Answer: (x - 8)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 27.41cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 9:14. What fraction of the counters are orange?
Answer: 9⁄23 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 31, 33, 48, what is the missing number?
Answer: 32