Keystones — Lintel
Five GCSE retrieval questions · 27 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,000,000 in standard form
Answer: 8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 13.28cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 7:12:10. What fraction of the sweets are pink?
Answer: 10⁄29 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 23, 17, 25, 34, what is the missing number?
Answer: 16