Keystones — Capstone
Five GCSE retrieval questions · 4 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√54
Answer: 15√6 -
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 = 18cm, b = 20cm, angle = 59°. Give your answer to 2 decimal places
Answer: 154.29cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 20, 87, 21, 76, 90, 98, 84. Give your answer to 2 decimal places
Answer: Mean = 71.63, Median = 85.5, Range = 78