Keystones — Lintel
Five GCSE retrieval questions · 27 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 140,000,000 in standard form
Answer: 1.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 850 ml
Answer: 80:17 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 44, 37, 41, 20, what is the missing number?
Answer: 8