Keystones — Capstone
Five GCSE retrieval questions · 9 March 2011 · 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 + 11x - 11
Answer: (x + 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 42°. Give your answer to 2 decimal places
Answer: 82.64cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 37, 16, 99, 65, 74, 11. Give your answer to 2 decimal places
Answer: Mean = 54.29, Median = 65, Range = 88