Keystones — Lintel
Five GCSE retrieval questions · 6 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 660,000 in standard form
Answer: 6.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.56cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 7:3. What fraction of the sweets are white?
Answer: 3⁄10 -
5. Statistics Mean
Calculate the mean of: 42, 31, 38, 7, 34, 25, 21, 16
Answer: 26.75