Keystones — Lintel
Five GCSE retrieval questions · 19 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.013 in standard form
Answer: 1.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 45°. Find opposite
Answer: 14cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 1:1:5. What fraction of the sweets are green?
Answer: 5⁄7 -
5. Statistics Mean
Calculate the mean of: 32, 31, 18, 25, 7, 22
Answer: 22.5