Keystones — Lintel
Five GCSE retrieval questions · 20 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.015 in standard form
Answer: 1.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x + 1
Answer: (x - 1)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 12.35cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 2:12:4. What fraction of the beads are purple?
Answer: 2⁄3 -
5. Statistics Mean
Calculate the mean of: 46, 16, 45, 47, 33, 46, 18, 6. Give your answer to 2 decimal places
Answer: 32.13