Keystones — Lintel
Five GCSE retrieval questions · 21 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 39,000,000 in standard form
Answer: 3.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 40
Answer: (x + 8)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 19.27cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 50 ml
Answer: 60:1 -
5. Statistics Mean
Calculate the mean of: 5, 43, 25, 40, 16, 36
Answer: 27.5