Keystones — Capstone
Five GCSE retrieval questions · 25 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: x² + x - 12
Answer: (x + 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 28cm, angle = 51°. Give your answer to 2 decimal places
Answer: 239.36cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 26, 27, 27, 30, 41, 41, 84. Give your answer to 2 decimal places
Answer: Mean = 41.88, Median = 35.5, Range = 58