Keystones — Lintel
Five GCSE retrieval questions · 8 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0028 in standard form
Answer: 2.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 9.74cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 850g
Answer: 80:17 -
5. Statistics Mean
Calculate the mean of: 27, 24, 28, 33, 29, 27, 42, 30
Answer: 30