Keystones — Lintel
Five GCSE retrieval questions · 1 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
80000000
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 46°. Find adjacent side
Answer: 20.cm -
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 6 numbers is 32. If 5 of them are 28, 44, 17, 17, 23, what is the missing number?
Answer: 63