Keystones — Lintel
Five GCSE retrieval questions · 7 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00047
Answer: 4.7 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 60°. Find opposite
Answer: 41.6cm -
4. Ratio Mixed ratio problems
In ratio 2:3:4, what fraction is the second part?
Answer: 3⁄9 -
5. Statistics Mean
Calculate the mean of: 40, 40, 30, 35, 12, 24
Answer: 30.2