Keystones — Lintel
Five GCSE retrieval questions · 1 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.044
Answer: 4.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 37°. Find adjacent side
Answer: 16cm -
4. Ratio Mixed ratio problems
In ratio 3:2:1, what fraction is the second part?
Answer: 2⁄6 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 49, 20, 31, what is the missing number?
Answer: 44