Keystones — Lintel
Five GCSE retrieval questions · 3 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0017 in standard form
Answer: 1.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.02cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 6:5. What fraction of the counters are purple?
Answer: 5⁄11 -
5. Statistics Mean
Calculate the mean of: 29, 11, 38, 23, 28, 25, 23, 26. Give your answer to 2 decimal places
Answer: 25.38