Keystones — Lintel
Five GCSE retrieval questions · 30 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 300,000,000 in standard form
Answer: 3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 60
Answer: (x + 10)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.81cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 4:2:3
Answer: 40, 20 and 30 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 40, 48, 25, what is the missing number?
Answer: 35