Keystones — Capstone
Five GCSE retrieval questions · 15 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 9
Answer: 3(x + 5)² - 66 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 50°. Give your answer to 2 decimal places
Answer: 94.61cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 20:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 77, 99, 99, 94, 90, 83, 84, 88. Give your answer to 2 decimal places
Answer: Mean = 88.89, Median = 88, Range = 22