Keystones — Lintel
Five GCSE retrieval questions · 11 January 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
730000
Answer: 7.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 50°. Find adjacent side
Answer: 18cm -
4. Ratio Mixed ratio problems
In ratio 4:3:2, what fraction is the second part?
Answer: 3⁄9 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 20, 34, 31, what is the missing number?
Answer: 11