Keystones — Lintel
Five GCSE retrieval questions · 15 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0024 in standard form
Answer: 2.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 60°. Find adjacent side
Answer: 13cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 2:4:1
Answer: 32, 64 and 16 -
5. Statistics Mean
Calculate the mean of: 33, 8, 41, 10, 11, 29, 43
Answer: 25