Keystones — Capstone
Five GCSE retrieval questions · 6 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² - 7x - 4
Answer: (x - 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 69°. Give your answer to 2 decimal places
Answer: 115.3cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 10, 46, 24, 59, 99, 75. Give your answer to 2 decimal places
Answer: Mean = 49.86, Median = 46, Range = 89