Keystones — Lintel
Five GCSE retrieval questions · 19 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00065 in standard form
Answer: 6.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 650 ml
Answer: 100:13 -
5. Statistics Mean
Calculate the mean of: 22, 40, 29, 34, 24, 8, 18, 8. Give your answer to 2 decimal places
Answer: 22.88