Keystones — Lintel
Five GCSE retrieval questions · 5 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 42,000,000 in standard form
Answer: 4.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 13.3cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 5:8:1. What fraction of the counters are green?
Answer: 1⁄14 -
5. Statistics Mean
Calculate the mean of: 17, 8, 9, 28, 10, 45, 10, 30. Give your answer to 2 decimal places
Answer: 19.63