Keystones — Lintel
Five GCSE retrieval questions · 14 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0065 in standard form
Answer: 6.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.63cm -
4. Ratio Mixed ratio problems
In ratio 6:10:8, what fraction is the second part?
Answer: 5⁄12 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 20, 24, 42, 38, what is the missing number?
Answer: 21