Keystones — Lintel
Five GCSE retrieval questions · 2 August 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
33000000
Answer: 3.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 52°. Find opposite
Answer: 24.3cm -
4. Ratio Mixed ratio problems
In ratio 2:1:4, what fraction is the second part?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 35, 39, 20, what is the missing number?
Answer: -2