Keystones — Lintel
Five GCSE retrieval questions · 13 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 390,000,000 in standard form
Answer: 3.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 22x + 121
Answer: (x - 11)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.55cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 3:8:10. What fraction of the sweets are orange?
Answer: 1⁄7 -
5. Statistics Mean
Calculate the mean of: 22, 20, 8, 37, 5, 14, 31. Give your answer to 2 decimal places
Answer: 19.57