Keystones — Lintel
Five GCSE retrieval questions · 31 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,900,000 in standard form
Answer: 7.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 56
Answer: (x + 8)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 33.18cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 5:13. What fraction of the sweets are purple?
Answer: 13⁄18 -
5. Statistics Mean
Calculate the mean of: 9, 8, 46, 45, 30, 33
Answer: 28.5