Keystones — Lintel
Five GCSE retrieval questions · 15 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 560,000 in standard form
Answer: 5.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.93cm -
4. Ratio Mixed ratio problems
Simplify: 18:9:18
Answer: 2:1:2 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 25, 29, 18, 20, 28, what is the missing number?
Answer: 6