Keystones — Lintel
Five GCSE retrieval questions · 13 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0095 in standard form
Answer: 9.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:9
Answer: 2:3:3 -
5. Statistics Mean
Calculate the mean of: 7, 27, 11, 15, 32, 21, 33, 39. Give your answer to 2 decimal places
Answer: 23.13