Keystones — Lintel
Five GCSE retrieval questions · 25 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
580000
Answer: 5.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 33°. Find adjacent side
Answer: 15.cm -
4. Ratio Mixed ratio problems
In ratio 4:1:3, what fraction is the second part?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 20, 31, 16, what is the missing number?
Answer: 33