Keystones — Lintel
Five GCSE retrieval questions · 9 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0008 in standard form
Answer: 8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.03cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 3:4:2
Answer: 63, 84 and 42 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 22, 23, 34, 33, 45, what is the missing number?
Answer: 23