Keystones — Lintel
Five GCSE retrieval questions · 28 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00053 in standard form
Answer: 5.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m : 85cm
Answer: 80:17 -
5. Statistics Mean
Calculate the mean of: 31, 12, 35, 25, 21, 44, 21, 38. Give your answer to 2 decimal places
Answer: 28.38