Keystones — Lintel
Five GCSE retrieval questions · 14 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0081 in standard form
Answer: 8.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.01cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 900 ml
Answer: 40:9 -
5. Statistics Mean
Calculate the mean of: 6, 27, 35, 8, 13, 10, 29, 17. Give your answer to 2 decimal places
Answer: 18.13