Keystones — Lintel
Five GCSE retrieval questions · 16 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000047 in standard form
Answer: 4.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 17.88cm -
4. Ratio Mixed ratio problems
Divide 260 in the ratio 3:4:3
Answer: 78, 104 and 78 -
5. Statistics Mean
Calculate the mean of: 48, 6, 14, 8, 18, 18, 13. Give your answer to 2 decimal places
Answer: 17.86