Keystones — Lintel
Five GCSE retrieval questions · 17 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 63,000 in standard form
Answer: 6.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 21x + 108
Answer: (x - 9)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 20.71cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 80cm
Answer: 5:4 -
5. Statistics Mean
Calculate the mean of: 24, 33, 11, 26, 33, 34, 38, 26. Give your answer to 2 decimal places
Answer: 28.13