Keystones — Lintel
Five GCSE retrieval questions · 2 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 26,000,000 in standard form
Answer: 2.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 31.06cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 13:4. What fraction of the beads are red?
Answer: 13⁄17 -
5. Statistics Mean
Calculate the mean of: 14, 21, 9, 23, 41, 36, 43, 35
Answer: 27.75