Keystones — Lintel
Five GCSE retrieval questions · 25 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,300,000 in standard form
Answer: 2.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 23.89cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 2:5. What fraction of the counters are orange?
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 7, 47, 28, 30, 43, 19, 34, 12
Answer: 27.5