Keystones — Lintel
Five GCSE retrieval questions · 31 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000 in standard form
Answer: 2.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 50
Answer: (x - 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.69cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:8
Answer: 3:5:2 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 19, 48, 23, 34, what is the missing number?
Answer: 31