Keystones — Lintel
Five GCSE retrieval questions · 7 September 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
14000000
Answer: 1.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 48°. Find adjacent side
Answer: 23.4cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:9
Answer: 2:3:3 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 23, 46, 15, 21, what is the missing number?
Answer: 95