Keystones — Lintel
Five GCSE retrieval questions · 10 October 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
70000
Answer: 7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 60°. Find opposite
Answer: 20.8cm -
4. Ratio Mixed ratio problems
In ratio 1:4:1, what fraction is the second part?
Answer: 4⁄6 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 22, 20, 47, 24, 42, what is the missing number?
Answer: 85