Keystones — Lintel
Five GCSE retrieval questions · 8 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000018 in standard form
Answer: 1.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 13.56cm -
4. Ratio Mixed ratio problems
Divide 72 in the ratio 1:1:4
Answer: 12, 12 and 48 -
5. Statistics Mean
Calculate the mean of: 13, 11, 46, 12, 30, 24, 28, 9. Give your answer to 2 decimal places
Answer: 21.63