Keystones — Lintel
Five GCSE retrieval questions · 11 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 300,000 in standard form
Answer: 3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 24.34cm -
4. Ratio Mixed ratio problems
Express the second part of 2:5 as a fraction in simplest form
Answer: 5⁄7 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 25, 45, 35, what is the missing number?
Answer: 27