Keystones — Lintel
Five GCSE retrieval questions · 30 September 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.078
Answer: 7.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 60°. Find opposite
Answer: 24.2cm -
4. Ratio Mixed ratio problems
In ratio 3:1:3, what fraction is the second part?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 26, 41, 16, what is the missing number?
Answer: 61