Keystones — Lintel
Five GCSE retrieval questions · 19 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0051 in standard form
Answer: 5.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.56cm -
4. Ratio Mixed ratio problems
Divide 60 in the ratio 2:1:3
Answer: 20, 10 and 30 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 22, 15, 48, 27, 24, what is the missing number?
Answer: 14