Keystones — Lintel
Five GCSE retrieval questions · 29 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.073 in standard form
Answer: 7.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 100
Answer: (x - 10)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 26.69cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 4:4:10. What fraction of the marbles are orange?
Answer: 2⁄9 -
5. Statistics Mean
Calculate the mean of: 29, 31, 19, 15, 32, 7, 33, 21. Give your answer to 2 decimal places
Answer: 23.38