Keystones — Lintel
Five GCSE retrieval questions · 2 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00093 in standard form
Answer: 9.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 88
Answer: (x + 11)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 15.02cm -
4. Ratio Mixed ratio problems
Simplify: 12:16:24
Answer: 3:4:6 -
5. Statistics Mean
Calculate the mean of: 40, 40, 22, 35, 21, 26, 11. Give your answer to 2 decimal places
Answer: 27.86