Keystones — Lintel
Five GCSE retrieval questions · 11 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0027 in standard form
Answer: 2.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.58cm -
4. Ratio Mixed ratio problems
In ratio 8:2:11, what fraction is the third part?
Answer: 11⁄21 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 42, 46, 38, what is the missing number?
Answer: 10