Keystones — Lintel
Five GCSE retrieval questions · 24 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00045 in standard form
Answer: 4.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.47cm -
4. Ratio Mixed ratio problems
£189.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £54.00 -
5. Statistics Mean
Calculate the mean of: 48, 32, 10, 25, 28, 38, 39. Give your answer to 2 decimal places
Answer: 31.43