Keystones — Lintel
Five GCSE retrieval questions · 5 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 97,000,000 in standard form
Answer: 9.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.87cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 3:3:1. What fraction of the beads are white?
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 21, 34, 10, 39, 6, 42, 45. Give your answer to 2 decimal places
Answer: 28.14