Keystones — Lintel
Five GCSE retrieval questions · 25 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00099 in standard form
Answer: 9.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.31cm -
4. Ratio Mixed ratio problems
Simplify: 10:6:10
Answer: 5:3:5 -
5. Statistics Mean
Calculate the mean of: 31, 23, 34, 28, 20, 27, 30, 47
Answer: 30