Keystones — Lintel
Five GCSE retrieval questions · 8 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.023
Answer: 2.3 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 45°. Find adjacent side
Answer: 22.6cm -
4. Ratio Mixed ratio problems
In ratio 1:4:4, what fraction is the second part?
Answer: 4⁄9 -
5. Statistics Mean
Calculate the mean of: 40, 43, 42, 33, 10, 15, 7
Answer: 27.1