Keystones — Lintel
Five GCSE retrieval questions · 30 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 160,000,000 in standard form
Answer: 1.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 84
Answer: (x + 12)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.46cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:24
Answer: 3:2:6 -
5. Statistics Mean
Calculate the mean of: 39, 49, 9, 30, 37, 7, 5. Give your answer to 2 decimal places
Answer: 25.14