Keystones — Lintel
Five GCSE retrieval questions · 3 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 68,000,000 in standard form
Answer: 6.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.53cm -
4. Ratio Mixed ratio problems
Simplify the ratio £2 : 65p
Answer: 40:13 -
5. Statistics Mean
Calculate the mean of: 41, 28, 37, 50, 34, 15, 11. Give your answer to 2 decimal places
Answer: 30.86