Keystones — Lintel
Five GCSE retrieval questions · 30 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.038 in standard form
Answer: 3.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 60°. Find adjacent side
Answer: 12.5cm -
4. Ratio Mixed ratio problems
£414.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £184.00 -
5. Statistics Mean
Calculate the mean of: 27, 42, 31, 30, 41, 38, 37. Give your answer to 2 decimal places
Answer: 35.14