Keystones — Lintel
Five GCSE retrieval questions · 19 June 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.001
Answer: 1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 49°. Find adjacent side
Answer: 11.2cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:6
Answer: 2:2:1 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 20, 40, 41, 39, what is the missing number?
Answer: 60