Keystones — Lintel
Five GCSE retrieval questions · 14 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0038
Answer: 3.8 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 33°. Find opposite
Answer: 16.2cm -
4. Ratio Mixed ratio problems
In ratio 2:4:1, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 12, 20, 10, 32, 22, 19, 6, 26
Answer: 18.4