Keystones — Lintel
Five GCSE retrieval questions · 11 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 840,000,000 in standard form
Answer: 8.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 27.96cm -
4. Ratio Mixed ratio problems
Simplify: 9:6:6
Answer: 3:2:2 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 41, 42, 19, 37, what is the missing number?
Answer: 26