Keystones — Lintel
Five GCSE retrieval questions · 14 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00096 in standard form
Answer: 9.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 36
Answer: (x + 12)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 60°. Find adjacent side
Answer: 14.5cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 12:8:11. What fraction of the beads are white?
Answer: 8⁄31 -
5. Statistics Mean
Calculate the mean of: 19, 15, 17, 28, 41, 45, 44, 5
Answer: 26.75