Keystones — Lintel
Five GCSE retrieval questions · 11 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 28,000,000 in standard form
Answer: 2.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 33.28cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 25p
Answer: 4:1 -
5. Statistics Mean
Calculate the mean of: 17, 14, 37, 18, 10, 42, 42, 36
Answer: 27