Keystones — Capstone
Five GCSE retrieval questions · 17 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 7
Answer: (x - 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 23cm, angle = 41°. Give your answer to 2 decimal places
Answer: 135.8cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 45:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 34, 27, 48, 90, 89, 53, 49, 98. Give your answer to 2 decimal places
Answer: Mean = 57.11, Median = 49, Range = 72