Keystones — Lintel
Five GCSE retrieval questions · 9 January 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0028
Answer: 2.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 56
Answer: (x + 8)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 29°. Find adjacent side
Answer: 33.2cm -
4. Ratio Mixed ratio problems
In ratio 1:3:2, what fraction is the second part?
Answer: 3⁄6 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 17, 15, 40, what is the missing number?
Answer: 68