Keystones — Lintel
Five GCSE retrieval questions · 27 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0042 in standard form
Answer: 4.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.2cm -
4. Ratio Mixed ratio problems
Simplify: 10:4:10
Answer: 5:2:5 -
5. Statistics Mean
Calculate the mean of: 37, 8, 41, 30, 48, 31, 37. Give your answer to 2 decimal places
Answer: 33.14