Keystones — Lintel
Five GCSE retrieval questions · 2 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 890,000,000 in standard form
Answer: 8.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.32cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 10:13. What fraction of the sweets are purple?
Answer: 13⁄23 -
5. Statistics Mean
Calculate the mean of: 22, 13, 8, 5, 39, 8, 44. Give your answer to 2 decimal places
Answer: 19.86