Keystones — Capstone
Five GCSE retrieval questions · 9 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 75°. Give your answer to 2 decimal places
Answer: 121.71cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 14:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 37, 70, 12, 19, 49, 66, 48, 75. Give your answer to 2 decimal places
Answer: Mean = 43.33, Median = 48, Range = 63