Keystones — Lintel
Five GCSE retrieval questions · 18 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 57,000 in standard form
Answer: 5.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 40
Answer: (x + 8)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 13.28cm -
4. Ratio Mixed ratio problems
In ratio 2:8:4, what fraction is the first part?
Answer: 1⁄7 -
5. Statistics Mean
Calculate the mean of: 18, 7, 29, 34, 27, 43, 48. Give your answer to 2 decimal places
Answer: 29.43