Keystones — Lintel
Five GCSE retrieval questions · 4 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 500,000,000 in standard form
Answer: 5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 5.77cm -
4. Ratio Mixed ratio problems
Simplify the ratio 9m : 40cm
Answer: 45:2 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 34, 23, 36, 18, what is the missing number?
Answer: 39