Keystones — Lintel
Five GCSE retrieval questions · 30 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00073
Answer: 7.3 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 47°. Find adjacent side
Answer: 21.cm -
4. Ratio Mixed ratio problems
In ratio 3:3:2, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
Calculate the mean of: 42, 14, 22, 32, 38, 32, 42, 24
Answer: 30.8