Keystones — Lintel
Five GCSE retrieval questions · 7 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000077 in standard form
Answer: 7.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 13.52cm -
4. Ratio Mixed ratio problems
Divide 203 in the ratio 2:1:4
Answer: 58, 29 and 116 -
5. Statistics Mean
Calculate the mean of: 23, 25, 34, 33, 24, 42, 19. Give your answer to 2 decimal places
Answer: 28.57