Keystones — Lintel
Five GCSE retrieval questions · 18 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
420000
Answer: 4.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 49°. Find opposite
Answer: 23cm -
4. Ratio Mixed ratio problems
In ratio 4:3:1, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 40, 28, 27, 28, what is the missing number?
Answer: 27