Keystones — Lintel
Five GCSE retrieval questions · 10 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,700,000 in standard form
Answer: 2.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.28cm -
4. Ratio Mixed ratio problems
In ratio 6:1:7, what fraction is the third part?
Answer: 1⁄2 -
5. Statistics Mean
Calculate the mean of: 28, 16, 42, 35, 44, 28. Give your answer to 2 decimal places
Answer: 32.17