Keystones — Lintel
Five GCSE retrieval questions · 24 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 190,000,000 in standard form
Answer: 1.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 110
Answer: (x + 10)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 12:2:3. What fraction of the beads are purple?
Answer: 2⁄17 -
5. Statistics Mean
Calculate the mean of: 47, 24, 29, 21, 12, 21, 9. Give your answer to 2 decimal places
Answer: 23.29