Keystones — Lintel
Five GCSE retrieval questions · 18 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.085 in standard form
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.39cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:6
Answer: 6:4:3 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 19, 27, 28, 46, what is the missing number?
Answer: 45