Keystones — Lintel
Five GCSE retrieval questions · 20 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.021 in standard form
Answer: 2.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 60
Answer: (x + 12)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 15.31cm -
4. Ratio Mixed ratio problems
In ratio 3:9:10, what fraction is the first part?
Answer: 3⁄22 -
5. Statistics Mean
Calculate the mean of: 28, 43, 18, 6, 29, 27. Give your answer to 2 decimal places
Answer: 25.17