Keystones — Lintel
Five GCSE retrieval questions · 6 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.027 in standard form
Answer: 2.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 28.9cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 14:9. What fraction of the beads are black?
Answer: 14⁄23 -
5. Statistics Mean
Calculate the mean of: 16, 23, 15, 23, 10, 11. Give your answer to 2 decimal places
Answer: 16.33