Keystones — Lintel
Five GCSE retrieval questions · 11 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 89,000,000 in standard form
Answer: 8.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 24.85cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 7:8. What fraction of the sweets are white?
Answer: 8⁄15 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 25, 35, 44, what is the missing number?
Answer: 40