Keystones — Lintel
Five GCSE retrieval questions · 8 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00054 in standard form
Answer: 5.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 23.47cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 1:11:7. What fraction of the marbles are red?
Answer: 1⁄19 -
5. Statistics Mean
Calculate the mean of: 23, 21, 11, 10, 32, 21, 14. Give your answer to 2 decimal places
Answer: 18.86