Keystones — Capstone
Five GCSE retrieval questions · 5 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
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 = 12cm, b = 24cm, angle = 70°. Give your answer to 2 decimal places
Answer: 135.32cm² -
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: 98, 45, 63, 100, 45, 69, 57, 89, 59. Give your answer to 2 decimal places
Answer: Mean = 69.44, Median = 63, Range = 55