Keystones — Lintel
Five GCSE retrieval questions · 14 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00039
Answer: 3.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 57°. Find opposite
Answer: 16.9cm -
4. Ratio Mixed ratio problems
In ratio 1:3:2, what fraction is the second part?
Answer: 3⁄6 -
5. Statistics Mean
Calculate the mean of: 45, 10, 24, 30, 32, 13, 5
Answer: 22.7