Keystones — Lintel
Five GCSE retrieval questions · 24 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0096 in standard form
Answer: 9.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 15.26cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 5:8:10. What fraction of the beads are purple?
Answer: 8⁄23 -
5. Statistics Mean
Calculate the mean of: 28, 49, 31, 49, 36, 21, 9, 50. Give your answer to 2 decimal places
Answer: 34.13