Keystones — Lintel
Five GCSE retrieval questions · 13 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 80,000,000 in standard form
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 450 ml
Answer: 80:9 -
5. Statistics Mean
Calculate the mean of: 39, 23, 48, 37, 32, 28, 17
Answer: 32