Keystones — Lintel
Five GCSE retrieval questions · 5 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 42,000 in standard form
Answer: 4.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 1:1:11. What fraction of the counters are yellow?
Answer: 11⁄13 -
5. Statistics Mean
Calculate the mean of: 41, 39, 46, 30, 35, 44, 24, 17
Answer: 34.5