Keystones — Lintel
Five GCSE retrieval questions · 22 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 35,000 in standard form
Answer: 3.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 80
Answer: (x - 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 13.94cm -
4. Ratio Mixed ratio problems
Simplify: 9:6:9
Answer: 3:2:3 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 45, 27, 40, 33, what is the missing number?
Answer: 20