Keystones — Lintel
Five GCSE retrieval questions · 7 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,000,000 in standard form
Answer: 2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.11cm -
4. Ratio Mixed ratio problems
Divide 270 in the ratio 2:2:1
Answer: 108, 108 and 54 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 45, 37, 18, 50, 30, what is the missing number?
Answer: 6