Keystones — Lintel
Five GCSE retrieval questions · 5 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0055 in standard form
Answer: 5.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 6
Answer: (x + 6)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 24.66cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 11:8:3. What fraction of the sweets are red?
Answer: 1⁄2 -
5. Statistics Mean
Calculate the mean of: 38, 36, 35, 27, 31, 20, 29. Give your answer to 2 decimal places
Answer: 30.86