Keystones — Lintel
Five GCSE retrieval questions · 3 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00095 in standard form
Answer: 9.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 20.86cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 40cm
Answer: 5:1 -
5. Statistics Mean
Calculate the mean of: 18, 27, 5, 13, 11, 19, 23, 42
Answer: 19.75