Keystones — Lintel
Five GCSE retrieval questions · 18 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 400,000 in standard form
Answer: 4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 16.42cm -
4. Ratio Mixed ratio problems
Simplify the ratio £7 : 25p
Answer: 28:1 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 37, 21, 36, what is the missing number?
Answer: 26