Keystones — Capstone
Five GCSE retrieval questions · 5 February 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 - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 68°. Give your answer to 2 decimal places
Answer: 185.44cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 51, 100, 97, 98, 89, 96, 69. Give your answer to 2 decimal places
Answer: Mean = 76.63, Median = 92.5, Range = 87