Keystones — Lintel
Five GCSE retrieval questions · 26 July 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
36000000
Answer: 3.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 61°. Find adjacent side
Answer: 16cm -
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 4 numbers is 23. If 3 of them are 28, 29, 26, what is the missing number?
Answer: 9