Keystones — Lintel
Five GCSE retrieval questions · 3 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0077 in standard form
Answer: 7.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 27
Answer: (x - 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.56cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 45 minutes
Answer: 16:3 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 24, 32, 34, what is the missing number?
Answer: 34