Keystones — Capstone
Five GCSE retrieval questions · 11 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: x² - 7x - 7
Answer: (x - 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 40°. Give your answer to 2 decimal places
Answer: 92.56cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 32:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 72, 75, 83, 68, 20, 37, 86. Give your answer to 2 decimal places
Answer: Mean = 67.13, Median = 73.5, Range = 76