Keystones — Lintel
Five GCSE retrieval questions · 29 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.087 in standard form
Answer: 8.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 60
Answer: (x + 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 60°. Find adjacent side
Answer: 19cm -
4. Ratio Mixed ratio problems
In ratio 8:1:2, what fraction is the third part?
Answer: 2⁄11 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 19, 19, 42, what is the missing number?
Answer: 8