Keystones — Lintel
Five GCSE retrieval questions · 24 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0042 in standard form
Answer: 4.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.55cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 litres : 900 ml
Answer: 20:9 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 16, 48, 15, what is the missing number?
Answer: 45