Keystones — Lintel
Five GCSE retrieval questions · 29 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000028 in standard form
Answer: 2.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 24.85cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 10:8. What fraction of the beads are orange?
Answer: 5⁄9 -
5. Statistics Mean
Calculate the mean of: 28, 45, 12, 19, 32, 33. Give your answer to 2 decimal places
Answer: 28.17