Keystones — Lintel
Five GCSE retrieval questions · 23 October 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.002
Answer: 2 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 32°. Find opposite
Answer: 13.7cm -
4. Ratio Mixed ratio problems
In ratio 1:2:4, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 21, 48, 15, 48, what is the missing number?
Answer: 8