Keystones — Lintel
Five GCSE retrieval questions · 30 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00094 in standard form
Answer: 9.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 99
Answer: (x - 9)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.5cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 1:11:11. What fraction of the counters are green?
Answer: 11⁄23 -
5. Statistics Mean
Calculate the mean of: 45, 50, 21, 38, 27, 35
Answer: 36