Keystones — Lintel
Five GCSE retrieval questions · 29 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0002
Answer: 2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 41°. Find adjacent side
Answer: 15.8cm -
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 5 numbers is 36. If 4 of them are 33, 22, 35, 24, what is the missing number?
Answer: 66