Keystones — Capstone
Five GCSE retrieval questions · 27 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 9x
Answer: (x + 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 52°. Give your answer to 2 decimal places
Answer: 94.56cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 46, 86, 72, 95, 63, 18, 23, 86. Give your answer to 2 decimal places
Answer: Mean = 60.67, Median = 63, Range = 77