Keystones — Lintel
Five GCSE retrieval questions · 14 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00067 in standard form
Answer: 6.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.57cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:18
Answer: 1:1:3 -
5. Statistics Mean
Calculate the mean of: 34, 25, 50, 6, 20, 24, 17. Give your answer to 2 decimal places
Answer: 25.14