Keystones — Lintel
Five GCSE retrieval questions · 2 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000016 in standard form
Answer: 1.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 38.48cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 4:10. What fraction of the counters are white?
Answer: 5⁄7 -
5. Statistics Mean
Calculate the mean of: 15, 22, 27, 12, 13, 18. Give your answer to 2 decimal places
Answer: 17.83