Keystones — Lintel
Five GCSE retrieval questions · 19 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000035 in standard form
Answer: 3.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 27.53cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 11:2. What fraction of the beads are orange?
Answer: 11⁄13 -
5. Statistics Mean
Calculate the mean of: 5, 16, 8, 12, 27, 47, 45. Give your answer to 2 decimal places
Answer: 22.86