Keystones — Lintel
Five GCSE retrieval questions · 21 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 120,000 in standard form
Answer: 1.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 4
Answer: (x + 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 16.78cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 2:5:7. What fraction of the sweets are orange?
Answer: 1⁄7 -
5. Statistics Mean
Calculate the mean of: 31, 42, 27, 5, 14, 31, 10, 20
Answer: 22.5