Keystones — Lintel
Five GCSE retrieval questions · 2 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00069 in standard form
Answer: 6.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x + 8
Answer: (x + 4)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.57cm -
4. Ratio Mixed ratio problems
Simplify: 18:15:9
Answer: 6:5:3 -
5. Statistics Mean
Calculate the mean of: 48, 7, 21, 44, 43, 39, 18. Give your answer to 2 decimal places
Answer: 31.43