Keystones — Lintel
Five GCSE retrieval questions · 26 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 670,000 in standard form
Answer: 6.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 72
Answer: (x + 12)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 13.51cm -
4. Ratio Mixed ratio problems
Express the second part of 3:8 as a fraction in simplest form
Answer: 8⁄11 -
5. Statistics Mean
Calculate the mean of: 30, 45, 9, 9, 39, 25, 28. Give your answer to 2 decimal places
Answer: 26.43