Keystones — Lintel
Five GCSE retrieval questions · 20 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 590,000,000 in standard form
Answer: 5.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 8.91cm -
4. Ratio Mixed ratio problems
Simplify the ratio £8 : 45p
Answer: 160:9 -
5. Statistics Mean
Calculate the mean of: 12, 9, 42, 12, 24, 7. Give your answer to 2 decimal places
Answer: 17.67