Keystones — Lintel
Five GCSE retrieval questions · 8 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000021 in standard form
Answer: 2.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 11.75cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 2:1:2
Answer: 60, 30 and 60 -
5. Statistics Mean
Calculate the mean of: 26, 39, 25, 38, 15, 15, 32, 17. Give your answer to 2 decimal places
Answer: 25.88