Keystones — Lintel
Five GCSE retrieval questions · 15 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,900,000 in standard form
Answer: 3.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.75cm -
4. Ratio Mixed ratio problems
Simplify: 16:24:12
Answer: 4:6:3 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 16, 50, 31, what is the missing number?
Answer: 51