Keystones — Lintel
Five GCSE retrieval questions · 4 March 2011 · 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 + 11x + 28
Answer: (x + 7)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.38cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 8:7:9. What fraction of the beads are red?
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 30, 7, 31, 9, 26, 49, 10. Give your answer to 2 decimal places
Answer: 23.14