Keystones — Lintel
Five GCSE retrieval questions · 5 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0012 in standard form
Answer: 1.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 15.53cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 3:2:3
Answer: 30, 20 and 30 -
5. Statistics Mean
Calculate the mean of: 20, 9, 23, 43, 24, 12, 17, 9. Give your answer to 2 decimal places
Answer: 19.63