Keystones — Lintel
Five GCSE retrieval questions · 29 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 55,000,000 in standard form
Answer: 5.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 23.32cm -
4. Ratio Mixed ratio problems
Simplify: 10:8:6
Answer: 5:4:3 -
5. Statistics Mean
Calculate the mean of: 49, 17, 47, 42, 21, 21. Give your answer to 2 decimal places
Answer: 32.83