Keystones — Lintel
Five GCSE retrieval questions · 31 August 2012 · 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 - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 60°. Find adjacent side
Answer: 18cm -
4. Ratio Mixed ratio problems
Simplify the ratio 9m : 25cm
Answer: 36:1 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 40, 32, 46, 38, 35, what is the missing number?
Answer: 13