Keystones — Lintel
Five GCSE retrieval questions · 28 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
310000
Answer: 3.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 50°. Find adjacent side
Answer: 18cm -
4. Ratio Mixed ratio problems
Express the first part of 4:3 as a fraction in simplest form
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 33, 38, 47, what is the missing number?
Answer: 42