Keystones — Lintel
Five GCSE retrieval questions · 7 September 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0026
Answer: 2.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 42°. Find opposite
Answer: 13.5cm -
4. Ratio Mixed ratio problems
In ratio 4:3:3, what fraction is the second part?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 19, 18, 34, 32, 25, what is the missing number?
Answer: 64