Keystones — Capstone
Five GCSE retrieval questions · 6 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 5x - 4
Answer: (x - 5⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 30cm, angle = 47°. Give your answer to 2 decimal places
Answer: 164.55cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 20:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 82, 99, 83, 81, 84, 78, 55, 97. Give your answer to 2 decimal places
Answer: Mean = 76.44, Median = 82, Range = 70