Keystones — Lintel
Five GCSE retrieval questions · 18 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.043 in standard form
Answer: 4.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 37.06cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 3:2:1
Answer: 60, 40 and 20 -
5. Statistics Mean
Calculate the mean of: 32, 44, 17, 21, 14, 25, 20, 26. Give your answer to 2 decimal places
Answer: 24.88