Keystones — Lintel
Five GCSE retrieval questions · 5 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00025 in standard form
Answer: 2.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 60
Answer: (x + 12)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.03cm -
4. Ratio Mixed ratio problems
Simplify: 12:18:6
Answer: 2:3:1 -
5. Statistics Mean
Calculate the mean of: 20, 46, 32, 23, 47, 11. Give your answer to 2 decimal places
Answer: 29.83