Keystones — Lintel
Five GCSE retrieval questions · 23 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
6400000
Answer: 6.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 47°. Find opposite
Answer: 20.4cm -
4. Ratio Mixed ratio problems
In ratio 3:4:2, what fraction is the second part?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 31, 34, 19, 28, what is the missing number?
Answer: 18