Keystones — Lintel
Five GCSE retrieval questions · 27 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000088 in standard form
Answer: 8.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 17x + 60
Answer: (x + 12)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 8.75cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 2:5. What fraction of the beads are purple?
Answer: 5⁄7 -
5. Statistics Mean
Calculate the mean of: 31, 22, 39, 17, 25, 40
Answer: 29