Keystones — Lintel
Five GCSE retrieval questions · 27 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 18,000,000 in standard form
Answer: 1.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 99
Answer: (x + 11)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.4cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 9:5. What fraction of the beads are red?
Answer: 9⁄14 -
5. Statistics Mean
Calculate the mean of: 40, 38, 23, 45, 47, 41, 15. Give your answer to 2 decimal places
Answer: 35.57