Keystones — Lintel
Five GCSE retrieval questions · 25 April 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0048
Answer: 4.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 29°. Find adjacent side
Answer: 19.2cm -
4. Ratio Mixed ratio problems
In ratio 2:3:4, what fraction is the second part?
Answer: 3⁄9 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 32, 43, 35, what is the missing number?
Answer: 2