Keystones — Capstone
Five GCSE retrieval questions · 14 February 2013 · 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 - 11x - 6
Answer: (x - 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 40°. Give your answer to 2 decimal places
Answer: 152.66cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 21, 81, 78, 73, 90, 66, 88. Give your answer to 2 decimal places
Answer: Mean = 71.13, Median = 75.5, Range = 69