Keystones — Lintel
Five GCSE retrieval questions · 15 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.025 in standard form
Answer: 2.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 11.34cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 1:2:3
Answer: 24, 48 and 72 -
5. Statistics Mean
Calculate the mean of: 10, 47, 47, 34, 20, 46, 44. Give your answer to 2 decimal places
Answer: 35.43