Keystones — Lintel
Five GCSE retrieval questions · 6 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00071
Answer: 7.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 64°. Find adjacent side
Answer: 9.2cm -
4. Ratio Mixed ratio problems
In ratio 1:4:4, what fraction is the second part?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 37, 49, 50, 21, what is the missing number?
Answer: 8