Keystones — Capstone
Five GCSE retrieval questions · 21 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 1
Answer: (x - 7⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 47°. Give your answer to 2 decimal places
Answer: 177.72cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 41, 24, 38, 69, 48, 99, 95. Give your answer to 2 decimal places
Answer: Mean = 56.88, Median = 44.5, Range = 75