Keystones — Lintel
Five GCSE retrieval questions · 3 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 190,000,000 in standard form
Answer: 1.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 10.17cm -
4. Ratio Mixed ratio problems
In ratio 3:6:12, what fraction is the first part?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 36, 41, 31, what is the missing number?
Answer: 28