Keystones — Capstone
Five GCSE retrieval questions · 2 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - x - 10
Answer: (x - 1⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 60°. Give your answer to 2 decimal places
Answer: 281.46cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 65, 27, 47, 74, 19, 83. Give your answer to 2 decimal places
Answer: Mean = 47.14, Median = 47, Range = 68