Keystones — Lintel
Five GCSE retrieval questions · 7 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000061 in standard form
Answer: 6.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 8.4cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 1:4:2
Answer: 10, 40 and 20 -
5. Statistics Mean
Calculate the mean of: 45, 6, 9, 9, 49, 41, 23
Answer: 26