Keystones — Lintel
Five GCSE retrieval questions · 18 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.072
Answer: 7.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 60°. Find adjacent side
Answer: 12cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 40, 21, 21, 38, what is the missing number?
Answer: 80