Keystones — Lintel
Five GCSE retrieval questions · 10 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0097
Answer: 9.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 45°. Find opposite
Answer: 19cm -
4. Ratio Mixed ratio problems
In ratio 3:2:2, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 24, 40, 24, what is the missing number?
Answer: 20