Keystones — Lintel
Five GCSE retrieval questions · 20 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000,000 in standard form
Answer: 1.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 100
Answer: (x - 10)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 15.26cm -
4. Ratio Mixed ratio problems
In ratio 10:10:12, what fraction is the second part?
Answer: 5⁄16 -
5. Statistics Mean
Calculate the mean of: 23, 47, 33, 19, 9, 36, 8, 9
Answer: 23