Keystones — Lintel
Five GCSE retrieval questions · 8 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 280,000 in standard form
Answer: 2.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 30
Answer: (x - 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 18.75cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 600 ml
Answer: 5:1 -
5. Statistics Mean
Calculate the mean of: 31, 25, 46, 45, 48, 47, 7, 42. Give your answer to 2 decimal places
Answer: 36.38