Keystones — Lintel
Five GCSE retrieval questions · 8 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 80,000,000 in standard form
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 40
Answer: (x + 10)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.03cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 6:7:8. What fraction of the beads are black?
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 5, 17, 48, 26, 27, 12, 35, 5. Give your answer to 2 decimal places
Answer: 21.88