Keystones — Lintel
Five GCSE retrieval questions · 24 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,300,000 in standard form
Answer: 4.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 30
Answer: (x + 6)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 60°. Find adjacent side
Answer: 10.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 200g
Answer: 20:1 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 42, 40, 40, what is the missing number?
Answer: 22