Keystones — Lintel
Five GCSE retrieval questions · 18 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 490,000,000 in standard form
Answer: 4.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 7.81cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 4:14. What fraction of the marbles are purple?
Answer: 7⁄9 -
5. Statistics Mean
Calculate the mean of: 20, 40, 5, 39, 50, 28, 12, 19. Give your answer to 2 decimal places
Answer: 26.63