Keystones — Lintel
Five GCSE retrieval questions · 21 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000049 in standard form
Answer: 4.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 60
Answer: (x + 10)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 43.3cm -
4. Ratio Mixed ratio problems
In ratio 9:8:5, what fraction is the third part?
Answer: 5⁄22 -
5. Statistics Mean
Calculate the mean of: 36, 29, 19, 16, 45, 26, 29, 7. Give your answer to 2 decimal places
Answer: 25.88