Keystones — Lintel
Five GCSE retrieval questions · 11 September 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.076
Answer: 7.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 42°. Find adjacent side
Answer: 23cm -
4. Ratio Mixed ratio problems
In ratio 3:3:2, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 46, 39, 16, 17, what is the missing number?
Answer: -8