Keystones — Lintel
Five GCSE retrieval questions · 18 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0041 in standard form
Answer: 4.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.43cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:10
Answer: 6:3:5 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 44, 25, 32, 32, what is the missing number?
Answer: 52