Keystones — Lintel
Five GCSE retrieval questions · 30 April 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00091
Answer: 9.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 42°. Find adjacent side
Answer: 26.8cm -
4. Ratio Mixed ratio problems
In ratio 3:1:3, what fraction is the second part?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 48, 18, 40, 19, what is the missing number?
Answer: 35