Keystones — Lintel
Five GCSE retrieval questions · 19 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0073 in standard form
Answer: 7.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 17.92cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 12:10. What fraction of the beads are red?
Answer: 6⁄11 -
5. Statistics Mean
Calculate the mean of: 9, 17, 20, 33, 22, 14. Give your answer to 2 decimal places
Answer: 19.17