Keystones — Lintel
Five GCSE retrieval questions · 19 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,500,000 in standard form
Answer: 5.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 16.05cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 8:7. What fraction of the sweets are red?
Answer: 8⁄15 -
5. Statistics Mean
Calculate the mean of: 18, 13, 34, 48, 25, 41. Give your answer to 2 decimal places
Answer: 29.83