Keystones — Lintel
Five GCSE retrieval questions · 4 June 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.003
Answer: 3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 41°. Find adjacent side
Answer: 13.6cm -
4. Ratio Mixed ratio problems
In ratio 2:4:1, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 30, 41, 49, 22, 17, what is the missing number?
Answer: -33