Keystones — Lintel
Five GCSE retrieval questions · 31 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
72000000
Answer: 7.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 59°. Find adjacent side
Answer: 13.4cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 21, 15, 46, 25, what is the missing number?
Answer: 63