Keystones — Lintel
Five GCSE retrieval questions · 10 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 610,000 in standard form
Answer: 6.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 45
Answer: (x - 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 33.61cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 20 minutes
Answer: 6:1 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 27, 20, 39, what is the missing number?
Answer: 58