Keystones — Lintel
Five GCSE retrieval questions · 9 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 410,000,000 in standard form
Answer: 4.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 9.01cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 15:5. What fraction of the counters are orange?
Answer: 3⁄4 -
5. Statistics Mean
Calculate the mean of: 36, 42, 13, 48, 19, 25, 32. Give your answer to 2 decimal places
Answer: 30.71