Keystones — Lintel
Five GCSE retrieval questions · 21 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 340,000,000 in standard form
Answer: 3.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 27.87cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 12:3. What fraction of the counters are red?
Answer: 4⁄5 -
5. Statistics Mean
Calculate the mean of: 38, 29, 30, 31, 40, 45
Answer: 35.5