Keystones — Lintel
Five GCSE retrieval questions · 5 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00098 in standard form
Answer: 9.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 19.99cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:6
Answer: 3:5:3 -
5. Statistics Mean
Calculate the mean of: 15, 40, 42, 38, 43, 36. Give your answer to 2 decimal places
Answer: 35.67