Keystones — Capstone
Five GCSE retrieval questions · 24 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² - 5x - 8
Answer: (x - 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 80°. Give your answer to 2 decimal places
Answer: 224.54cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 84, 49, 30, 54, 54, 34, 42. Give your answer to 2 decimal places
Answer: Mean = 50.63, Median = 51.5, Range = 54