Keystones — Capstone
Five GCSE retrieval questions · 30 January 2012 · 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 + 11x + 11
Answer: (x + 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 24cm, angle = 50°. Give your answer to 2 decimal places
Answer: 257.39cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 49:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 62, 55, 21, 60, 25, 72, 19, 92. Give your answer to 2 decimal places
Answer: Mean = 48.56, Median = 55, Range = 73