Keystones — Lintel
Five GCSE retrieval questions · 17 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00009 in standard form
Answer: 9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 80
Answer: (x + 10)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 42.84cm -
4. Ratio Mixed ratio problems
Divide 210 in the ratio 1:4:2
Answer: 30, 120 and 60 -
5. Statistics Mean
Calculate the mean of: 36, 15, 37, 15, 24, 23, 17, 31
Answer: 24.75