Keystones — Lintel
Five GCSE retrieval questions · 24 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 450,000 in standard form
Answer: 4.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 60
Answer: (x + 10)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.18cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 1:1:4
Answer: 28, 28 and 112 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 21, 40, 18, what is the missing number?
Answer: 41