Keystones — Lintel
Five GCSE retrieval questions · 16 May 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00074
Answer: 7.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 35°. Find opposite
Answer: 16.cm -
4. Ratio Mixed ratio problems
In ratio 1:2:3, what fraction is the second part?
Answer: 2⁄6 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 33, 30, 28, 21, 50, what is the missing number?
Answer: -36