Keystones — Lintel
Five GCSE retrieval questions · 2 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 710,000 in standard form
Answer: 7.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 22
Answer: (x + 11)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.31cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:6
Answer: 2:1:1 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 43, 20, 19, 37, what is the missing number?
Answer: 21