Keystones — Capstone
Five GCSE retrieval questions · 6 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 9
Answer: (x - 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 20cm, angle = 42°. Give your answer to 2 decimal places
Answer: 120.44cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 27:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 17, 19, 98, 38, 11, 36. Give your answer to 2 decimal places
Answer: Mean = 38.29, Median = 36, Range = 87