Keystones — Lintel
Five GCSE retrieval questions · 12 October 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
13000
Answer: 1.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 61°. Find adjacent side
Answer: 8.7cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 50, 15, 16, 47, what is the missing number?
Answer: -13