Keystones — Lintel
Five GCSE retrieval questions · 21 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 43,000,000 in standard form
Answer: 4.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.79cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 200g
Answer: 25:1 -
5. Statistics Mean
Calculate the mean of: 20, 20, 43, 50, 45, 7. Give your answer to 2 decimal places
Answer: 30.83