Keystones — Lintel
Five GCSE retrieval questions · 23 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00061 in standard form
Answer: 6.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.06cm -
4. Ratio Mixed ratio problems
In ratio 1:3:10, what fraction is the third part?
Answer: 5⁄7 -
5. Statistics Mean
Calculate the mean of: 46, 21, 13, 8, 14, 10, 32, 44
Answer: 23.5