Keystones — Lintel
Five GCSE retrieval questions · 22 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000031 in standard form
Answer: 3.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.7cm -
4. Ratio Mixed ratio problems
£266.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £76.00 -
5. Statistics Mean
Calculate the mean of: 22, 6, 41, 11, 46, 17, 36. Give your answer to 2 decimal places
Answer: 25.57