Keystones — Lintel
Five GCSE retrieval questions · 9 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0061 in standard form
Answer: 6.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 17.11cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 800g
Answer: 5:1 -
5. Statistics Mean
Calculate the mean of: 50, 31, 48, 42, 48, 25, 12, 22
Answer: 34.75