Keystones — Lintel
Five GCSE retrieval questions · 7 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 54
Answer: (x - 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.19cm -
4. Ratio Mixed ratio problems
In ratio 11:1:3, what fraction is the first part?
Answer: 11⁄15 -
5. Statistics Mean
Calculate the mean of: 41, 27, 32, 47, 46, 15. Give your answer to 2 decimal places
Answer: 34.67