Keystones — Lintel
Five GCSE retrieval questions · 25 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 620,000,000 in standard form
Answer: 6.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.13cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 3:5:1. What fraction of the sweets are blue?
Answer: 5⁄9 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 23, 45, 35, what is the missing number?
Answer: 37