Keystones — Lintel
Five GCSE retrieval questions · 25 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.045
Answer: 4.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 42°. Find adjacent side
Answer: 13.4cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:12
Answer: 3:1:3 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 25, 25, 44, 17, what is the missing number?
Answer: 29