Keystones — Lintel
Five GCSE retrieval questions · 28 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 450,000,000 in standard form
Answer: 4.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 60°. Find adjacent side
Answer: 18cm -
4. Ratio Mixed ratio problems
Express the second part of 5:14 as a fraction in simplest form
Answer: 14⁄19 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 24, 31, 33, 38, 31, what is the missing number?
Answer: 23