Keystones — Capstone
Five GCSE retrieval questions · 5 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 77°. Give your answer to 2 decimal places
Answer: 214.36cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 9:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 98, 11, 76, 67, 47, 30, 83, 62. Give your answer to 2 decimal places
Answer: Mean = 58.33, Median = 62, Range = 87