Keystones — Lintel
Five GCSE retrieval questions · 29 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 450,000,000 in standard form
Answer: 4.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 4:1:1
Answer: 100, 25 and 25 -
5. Statistics Mean
Calculate the mean of: 19, 39, 36, 18, 11, 45, 45, 36. Give your answer to 2 decimal places
Answer: 31.13