Keystones — Lintel
Five GCSE retrieval questions · 12 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 840,000 in standard form
Answer: 8.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.08cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 45, 40, 39, 43, what is the missing number?
Answer: 23