Keystones — Lintel
Five GCSE retrieval questions · 2 November 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.043
Answer: 4.3 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 52°. Find adjacent side
Answer: 13.5cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 17, 20, 24, 17, 16, what is the missing number?
Answer: 104