Keystones — Capstone
Five GCSE retrieval questions · 30 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² + x - 1
Answer: (x + 1⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 73°. Give your answer to 2 decimal places
Answer: 86.07cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 23, 59, 98, 79, 20, 82, 64
Answer: Mean = 60.25, Median = 61.5, Range = 78