Keystones — Lintel
Five GCSE retrieval questions · 28 March 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 + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 42°. Find adjacent side
Answer: 27.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 28, 19, 44, 27, 32, what is the missing number?
Answer: 42