Keystones — Lintel
Five GCSE retrieval questions · 22 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00053
Answer: 5.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 45°. Find opposite
Answer: 23cm -
4. Ratio Mixed ratio problems
In ratio 1:4:1, what fraction is the second part?
Answer: 4⁄6 -
5. Statistics Mean
Calculate the mean of: 17, 23, 21, 17, 29, 32, 14, 45
Answer: 24.8