Keystones — Lintel
Five GCSE retrieval questions · 24 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00023 in standard form
Answer: 2.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 15.01cm -
4. Ratio Mixed ratio problems
Simplify: 16:24:24
Answer: 2:3:3 -
5. Statistics Mean
Calculate the mean of: 22, 24, 10, 25, 10, 16, 7. Give your answer to 2 decimal places
Answer: 16.29