Keystones — Lintel
Five GCSE retrieval questions · 20 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 53,000,000 in standard form
Answer: 5.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.43cm -
4. Ratio Mixed ratio problems
Simplify: 10:10:12
Answer: 5:5:6 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 32, 41, 39, what is the missing number?
Answer: 28