Keystones — Lintel
Five GCSE retrieval questions · 23 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 79,000,000 in standard form
Answer: 7.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 8.75cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 10cm
Answer: 10:1 -
5. Statistics Mean
Calculate the mean of: 5, 15, 31, 18, 18, 20, 21. Give your answer to 2 decimal places
Answer: 18.29