Keystones — Lintel
Five GCSE retrieval questions · 31 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000034 in standard form
Answer: 3.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 13.3cm -
4. Ratio Mixed ratio problems
Simplify: 9:6:18
Answer: 3:2:6 -
5. Statistics Mean
Calculate the mean of: 5, 48, 46, 22, 18, 14, 6, 28. Give your answer to 2 decimal places
Answer: 23.38