Keystones — Lintel
Five GCSE retrieval questions · 8 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00025 in standard form
Answer: 2.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 15.59cm -
4. Ratio Mixed ratio problems
Simplify the ratio £3 : 70p
Answer: 30:7 -
5. Statistics Mean
Calculate the mean of: 31, 47, 8, 44, 38, 29, 36, 48. Give your answer to 2 decimal places
Answer: 35.13