Keystones — Capstone
Five GCSE retrieval questions · 14 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² - 9x - 5
Answer: (x - 9⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 42°. Give your answer to 2 decimal places
Answer: 262.3cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 67, 31, 58, 62, 85, 20. Give your answer to 2 decimal places
Answer: Mean = 55.43, Median = 62, Range = 65