Keystones — Lintel
Five GCSE retrieval questions · 24 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000051 in standard form
Answer: 5.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.86cm -
4. Ratio Mixed ratio problems
In ratio 8:5:8, what fraction is the first part?
Answer: 8⁄21 -
5. Statistics Mean
Calculate the mean of: 15, 6, 22, 8, 27, 13. Give your answer to 2 decimal places
Answer: 15.17