Keystones — Lintel
Five GCSE retrieval questions · 6 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 26,000 in standard form
Answer: 2.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 72
Answer: (x - 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.65cm -
4. Ratio Mixed ratio problems
In ratio 12:8:7, what fraction is the second part?
Answer: 8⁄27 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 36, 20, 16, 18, what is the missing number?
Answer: 70