Keystones — Lintel
Five GCSE retrieval questions · 30 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,100,000 in standard form
Answer: 2.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 64
Answer: (x - 8)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.35cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:16
Answer: 3:5:4 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 21, 33, 44, what is the missing number?
Answer: 10