Keystones — Lintel
Five GCSE retrieval questions · 19 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000078 in standard form
Answer: 7.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 84
Answer: (x + 12)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.21cm -
4. Ratio Mixed ratio problems
In ratio 12:2:7, what fraction is the third part?
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 27, 23, 11, 45, 49, 25
Answer: 30