Keystones — Lintel
Five GCSE retrieval questions · 13 November 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00039
Answer: 3.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 59°. Find opposite
Answer: 34.9cm -
4. Ratio Mixed ratio problems
In ratio 1:3:1, what fraction is the second part?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 42, 35, 16, what is the missing number?
Answer: 67