Keystones — Lintel
Five GCSE retrieval questions · 23 May 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00016
Answer: 1.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 30°. Find opposite
Answer: 8.cm -
4. Ratio Mixed ratio problems
In ratio 1:2:4, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 15, 32, 38, 44, 22, what is the missing number?
Answer: 83