Keystones — Lintel
Five GCSE retrieval questions · 17 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.052 in standard form
Answer: 5.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 14
Answer: (x + 7)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 51.96cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 8:1:12. What fraction of the marbles are pink?
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 27, 22, 31, 23, 11, 29, 41. Give your answer to 2 decimal places
Answer: 26.29