Keystones — Lintel
Five GCSE retrieval questions · 28 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 47,000,000 in standard form
Answer: 4.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.37cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 2:5:1. What fraction of the beads are black?
Answer: 1⁄4 -
5. Statistics Mean
Calculate the mean of: 11, 29, 37, 38, 46, 41, 32. Give your answer to 2 decimal places
Answer: 33.43