Keystones — Lintel
Five GCSE retrieval questions · 9 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.068 in standard form
Answer: 6.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 15.55cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 14:4. What fraction of the marbles are red?
Answer: 7⁄9 -
5. Statistics Mean
Calculate the mean of: 47, 26, 42, 10, 9, 29. Give your answer to 2 decimal places
Answer: 27.17