Keystones — Lintel
Five GCSE retrieval questions · 21 June 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 550,000,000 in standard form
Answer: 5.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 30
Answer: (x - 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 25.93cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 6:8. What fraction of the marbles are white?
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 43, 46, 15, 44, 46, 49, 19. Give your answer to 2 decimal places
Answer: 37.43