Keystones — Lintel
Five GCSE retrieval questions · 20 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000028 in standard form
Answer: 2.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 60
Answer: (x + 12)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 12.99cm -
4. Ratio Mixed ratio problems
Simplify: 18:12:6
Answer: 3:2:1 -
5. Statistics Mean
Calculate the mean of: 17, 26, 7, 42, 23, 25, 5, 9
Answer: 19.25