Keystones — Lintel
Five GCSE retrieval questions · 3 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000015 in standard form
Answer: 1.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 14.53cm -
4. Ratio Mixed ratio problems
Divide 92 in the ratio 1:1:2
Answer: 23, 23 and 46 -
5. Statistics Mean
Calculate the mean of: 31, 15, 41, 26, 21, 32, 12. Give your answer to 2 decimal places
Answer: 25.43