Keystones — Lintel
Five GCSE retrieval questions · 15 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00068 in standard form
Answer: 6.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.49cm -
4. Ratio Mixed ratio problems
In ratio 8:7:5, what fraction is the second part?
Answer: 7⁄20 -
5. Statistics Mean
Calculate the mean of: 39, 47, 49, 45, 39, 24
Answer: 40.5