Keystones — Lintel
Five GCSE retrieval questions · 27 October 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.096
Answer: 9.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 45°. Find adjacent side
Answer: 16.3cm -
4. Ratio Mixed ratio problems
Simplify: 18:12:6
Answer: 3:2:1 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 16, 18, 27, 27, what is the missing number?
Answer: 27