Keystones — Lintel
Five GCSE retrieval questions · 8 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 62,000,000 in standard form
Answer: 6.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.59cm -
4. Ratio Mixed ratio problems
Black, white and yellow marbles are in the ratio 11:5:2. What fraction of the marbles are black?
Answer: 11⁄18 -
5. Statistics Mean
Calculate the mean of: 31, 46, 9, 8, 47, 23, 23. Give your answer to 2 decimal places
Answer: 26.71