Keystones — Lintel
Five GCSE retrieval questions · 25 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.037 in standard form
Answer: 3.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x - 11
Answer: (x + 11)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.81cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:6
Answer: 2:1:1 -
5. Statistics Mean
Calculate the mean of: 30, 32, 15, 40, 35, 43, 5, 14
Answer: 26.75