Keystones — Lintel
Five GCSE retrieval questions · 8 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.097 in standard form
Answer: 9.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 32cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 25 minutes
Answer: 36:5 -
5. Statistics Mean
Calculate the mean of: 44, 16, 19, 11, 38, 18, 33, 22. Give your answer to 2 decimal places
Answer: 25.13