Keystones — Lintel
Five GCSE retrieval questions · 2 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.025 in standard form
Answer: 2.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.34cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 12:11. What fraction of the beads are red?
Answer: 12⁄23 -
5. Statistics Mean
Calculate the mean of: 34, 35, 38, 17, 49, 6, 15. Give your answer to 2 decimal places
Answer: 27.71