Keystones — Lintel
Five GCSE retrieval questions · 6 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00065 in standard form
Answer: 6.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 60°. Find adjacent side
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 950 ml
Answer: 80:19 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 29, 24, 32, 26, what is the missing number?
Answer: 44