Keystones — Lintel
Five GCSE retrieval questions · 30 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 18,000,000 in standard form
Answer: 1.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.7cm -
4. Ratio Mixed ratio problems
In ratio 8:9:5, what fraction is the third part?
Answer: 5⁄22 -
5. Statistics Mean
Calculate the mean of: 16, 23, 37, 40, 17, 5
Answer: 23