Keystones — Lintel
Five GCSE retrieval questions · 3 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 270,000 in standard form
Answer: 2.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.87cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 1:2:2
Answer: 30, 60 and 60 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 43, 16, 44, 38, what is the missing number?
Answer: 34