Keystones — Capstone
Five GCSE retrieval questions · 15 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 14
Answer: 5(x + 4)² - 66 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 14cm, angle = 75°. Give your answer to 2 decimal places
Answer: 81.14cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 28:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 88, 97, 81, 72, 100, 37, 10, 73. Give your answer to 2 decimal places
Answer: Mean = 63.89, Median = 73, Range = 90