Keystones — Lintel
Five GCSE retrieval questions · 30 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
35000
Answer: 3.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 54°. Find adjacent side
Answer: 14.7cm -
4. Ratio Mixed ratio problems
In ratio 1:1:3, what fraction is the second part?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 29, 35, 19, 50, what is the missing number?
Answer: 67