Keystones — Lintel
Five GCSE retrieval questions · 5 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00066
Answer: 6.6 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 41°. Find adjacent side
Answer: 13.6cm -
4. Ratio Mixed ratio problems
In ratio 2:4:4, what fraction is the second part?
Answer: 4⁄10 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 46, 46, 32, what is the missing number?
Answer: -44