Keystones — Lintel
Five GCSE retrieval questions · 23 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 50
Answer: (x + 10)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.24cm -
4. Ratio Mixed ratio problems
Simplify: 8:4:4
Answer: 2:1:1 -
5. Statistics Mean
Calculate the mean of: 31, 31, 13, 43, 25, 33. Give your answer to 2 decimal places
Answer: 29.33