Keystones — Lintel
Five GCSE retrieval questions · 15 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,700,000 in standard form
Answer: 2.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 19.91cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 3:5. What fraction of the beads are purple?
Answer: 5⁄8 -
5. Statistics Mean
Calculate the mean of: 35, 20, 14, 36, 26, 49, 31, 27
Answer: 29.75