Keystones — Lintel
Five GCSE retrieval questions · 4 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0062 in standard form
Answer: 6.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 60°. Find adjacent side
Answer: 12cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 5:4. What fraction of the beads are white?
Answer: 4⁄9 -
5. Statistics Mean
Calculate the mean of: 21, 16, 37, 13, 16, 35
Answer: 23