Keystones — Lintel
Five GCSE retrieval questions · 17 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.029
Answer: 2.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 31°. Find opposite
Answer: 14.4cm -
4. Ratio Mixed ratio problems
In ratio 3:2:1, what fraction is the second part?
Answer: 2⁄6 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 45, 50, 30, what is the missing number?
Answer: -21