Keystones — Lintel
Five GCSE retrieval questions · 8 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 870,000,000 in standard form
Answer: 8.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 50
Answer: (x + 10)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.01cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 3:10:9. What fraction of the sweets are blue?
Answer: 5⁄11 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 36, 39, 22, 30, 42, what is the missing number?
Answer: 29