Keystones — Lintel
Five GCSE retrieval questions · 26 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,000,000 in standard form
Answer: 3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.5cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 11:9. What fraction of the counters are purple?
Answer: 9⁄20 -
5. Statistics Mean
Calculate the mean of: 35, 31, 15, 10, 24, 9, 34, 10
Answer: 21