Keystones — Lintel
Five GCSE retrieval questions · 6 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.085 in standard form
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 99
Answer: (x - 9)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 15.49cm -
4. Ratio Mixed ratio problems
£243.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £135.00 -
5. Statistics Mean
Calculate the mean of: 20, 8, 5, 39, 50, 7, 24, 36. Give your answer to 2 decimal places
Answer: 23.63