Keystones — Capstone
Five GCSE retrieval questions · 6 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: x² - 5x + 2
Answer: (x - 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 13cm, angle = 65°. Give your answer to 2 decimal places
Answer: 129.6cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 69, 25, 44, 34, 37, 37, 75, 81. Give your answer to 2 decimal places
Answer: Mean = 49.78, Median = 44, Range = 56