Keystones — Lintel
Five GCSE retrieval questions · 20 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00042
Answer: 4.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 27°. Find adjacent side
Answer: 33cm -
4. Ratio Mixed ratio problems
In ratio 2:2:4, what fraction is the second part?
Answer: 2⁄8 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 41, 25, 17, 16, what is the missing number?
Answer: 46