Keystones — Lintel
Five GCSE retrieval questions · 28 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 87,000 in standard form
Answer: 8.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 8.39cm -
4. Ratio Mixed ratio problems
In ratio 8:11:4, what fraction is the first part?
Answer: 8⁄23 -
5. Statistics Mean
Calculate the mean of: 5, 17, 40, 33, 17, 47, 43, 5. Give your answer to 2 decimal places
Answer: 25.88