Keystones — Lintel
Five GCSE retrieval questions · 4 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000066 in standard form
Answer: 6.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 16.66cm -
4. Ratio Mixed ratio problems
In ratio 8:6:7, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 8, 14, 7, 41, 6, 8
Answer: 14