Keystones — Lintel
Five GCSE retrieval questions · 31 October 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.023
Answer: 2.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 29°. Find adjacent side
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 17, 31, 27, 45, what is the missing number?
Answer: 45