Keystones — Lintel
Five GCSE retrieval questions · 8 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
9400000
Answer: 9.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 43°. Find adjacent side
Answer: 23.4cm -
4. Ratio Mixed ratio problems
In ratio 2:4:1, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 46, 21, 22, 38, 33, what is the missing number?
Answer: 38