Keystones — Lintel
Five GCSE retrieval questions · 12 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0002
Answer: 2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 41°. Find opposite
Answer: 12.2cm -
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 27. If 4 of them are 19, 39, 47, 45, what is the missing number?
Answer: -15