Keystones — Lintel
Five GCSE retrieval questions · 15 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 72
Answer: (x + 12)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.72cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:18
Answer: 1:3:3 -
5. Statistics Mean
Calculate the mean of: 8, 30, 9, 13, 33, 47, 25. Give your answer to 2 decimal places
Answer: 23.57