Keystones — Capstone
Five GCSE retrieval questions · 14 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 57°. Give your answer to 2 decimal places
Answer: 192.89cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 15:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 76, 69, 21, 19, 78, 92, 65. Give your answer to 2 decimal places
Answer: Mean = 63.13, Median = 72.5, Range = 73