Keystones — Lintel
Five GCSE retrieval questions · 26 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00031
Answer: 3.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 35°. Find adjacent side
Answer: 18cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:6
Answer: 2:6:3 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 38, 21, 17, what is the missing number?
Answer: 40