Keystones — Lintel
Five GCSE retrieval questions · 30 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,200,000 in standard form
Answer: 5.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.78cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 1:3:1
Answer: 14, 42 and 14 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 36, 16, 17, 46, what is the missing number?
Answer: 20