Keystones — Lintel
Five GCSE retrieval questions · 29 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
54000000
Answer: 5.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 28°. Find adjacent side
Answer: 30.9cm -
4. Ratio Mixed ratio problems
In ratio 3:3:2, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 18, 31, 28, what is the missing number?
Answer: 43