Keystones — Lintel
Five GCSE retrieval questions · 23 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 630,000,000 in standard form
Answer: 6.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 31.85cm -
4. Ratio Mixed ratio problems
In ratio 5:7:8, what fraction is the second part?
Answer: 7⁄20 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 36, 22, 37, 50, what is the missing number?
Answer: 10