Keystones — Lintel
Five GCSE retrieval questions · 2 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.078 in standard form
Answer: 7.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 36
Answer: (x - 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 29.91cm -
4. Ratio Mixed ratio problems
Simplify the ratio £3 : 35p
Answer: 60:7 -
5. Statistics Mean
Calculate the mean of: 38, 30, 28, 10, 49, 30. Give your answer to 2 decimal places
Answer: 30.83