Keystones — Lintel
Five GCSE retrieval questions · 17 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.06 in standard form
Answer: 6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.49cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 13:9. What fraction of the beads are black?
Answer: 13⁄22 -
5. Statistics Mean
Calculate the mean of: 10, 40, 32, 21, 41, 30, 22
Answer: 28