Keystones — Lintel
Five GCSE retrieval questions · 5 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0026 in standard form
Answer: 2.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 35.7cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 8:11. What fraction of the marbles are orange?
Answer: 8⁄19 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 17, 46, 29, 17, 38, what is the missing number?
Answer: 9