Keystones — Lintel
Five GCSE retrieval questions · 5 November 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0066
Answer: 6.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 38°. Find adjacent side
Answer: 22.cm -
4. Ratio Mixed ratio problems
In ratio 1:2:3, what fraction is the second part?
Answer: 2⁄6 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 32, 44, 22, 47, what is the missing number?
Answer: 5