Keystones — Lintel
Five GCSE retrieval questions · 18 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
950000
Answer: 9.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 33°. Find adjacent side
Answer: 31cm -
4. Ratio Mixed ratio problems
Express the first part of 3:4 as a fraction in simplest form
Answer: 3⁄7 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 46, 46, 29, 43, 36, what is the missing number?
Answer: 40