Keystones — Lintel
Five GCSE retrieval questions · 13 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000018 in standard form
Answer: 1.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 45°. Find opposite
Answer: 24cm -
4. Ratio Mixed ratio problems
Simplify: 18:9:12
Answer: 6:3:4 -
5. Statistics Mean
Calculate the mean of: 40, 13, 17, 48, 42, 8
Answer: 28