Keystones — Capstone
Five GCSE retrieval questions · 4 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 9x + 3
Answer: (x - 9⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 20cm, angle = 68°. Give your answer to 2 decimal places
Answer: 166.89cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 9:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 44, 97, 10, 100, 43, 24, 79, 92. Give your answer to 2 decimal places
Answer: Mean = 61.67, Median = 66, Range = 90