Keystones — Lintel
Five GCSE retrieval questions · 25 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 140,000 in standard form
Answer: 1.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 23.46cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 2:3. What fraction of the marbles are white?
Answer: 3⁄5 -
5. Statistics Mean
Calculate the mean of: 43, 41, 33, 35, 47, 19. Give your answer to 2 decimal places
Answer: 36.33