Keystones — Lintel
Five GCSE retrieval questions · 21 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00086 in standard form
Answer: 8.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.84cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 5 minutes
Answer: 60:1 -
5. Statistics Mean
Calculate the mean of: 23, 16, 10, 36, 22, 8. Give your answer to 2 decimal places
Answer: 19.17