Keystones — Lintel
Five GCSE retrieval questions · 29 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00063 in standard form
Answer: 6.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 4
Answer: (x - 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 11:12. What fraction of the beads are white?
Answer: 12⁄23 -
5. Statistics Mean
Calculate the mean of: 7, 23, 49, 50, 10, 9. Give your answer to 2 decimal places
Answer: 24.67