Keystones — Lintel
Five GCSE retrieval questions · 4 August 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00084
Answer: 8.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 55°. Find opposite
Answer: 20cm -
4. Ratio Mixed ratio problems
In ratio 3:2:4, what fraction is the second part?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 17, 35, 48, what is the missing number?
Answer: 56