Keystones — Lintel
Five GCSE retrieval questions · 30 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0017
Answer: 1.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 51°. Find adjacent side
Answer: 18.3cm -
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 22. If 3 of them are 39, 17, 16, what is the missing number?
Answer: 16