Keystones — Capstone
Five GCSE retrieval questions · 4 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 7x - 6
Answer: (x - 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 44°. Give your answer to 2 decimal places
Answer: 150.05cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 16:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 32, 43, 35, 56, 78, 25, 85. Give your answer to 2 decimal places
Answer: Mean = 56.13, Median = 49.5, Range = 70