Keystones — Lintel
Five GCSE retrieval questions · 7 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
380000
Answer: 3.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 38°. Find adjacent side
Answer: 18.9cm -
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 21. If 4 of them are 44, 35, 22, 32, what is the missing number?
Answer: -28