Keystones — Lintel
Five GCSE retrieval questions · 26 November 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0035
Answer: 3.5 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 48°. Find opposite
Answer: 31.cm -
4. Ratio Mixed ratio problems
In ratio 3:4:2, what fraction is the second part?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 23, 22, 43, what is the missing number?
Answer: 20