Keystones — Lintel
Five GCSE retrieval questions · 18 September 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.052
Answer: 5.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 46°. Find adjacent side
Answer: 22.9cm -
4. Ratio Mixed ratio problems
In ratio 3:3:4, what fraction is the second part?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 20, 35, 46, 40, what is the missing number?
Answer: 39