Keystones — Capstone
Five GCSE retrieval questions · 29 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - 9x + 5
Answer: (x - 9⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 77°. Give your answer to 2 decimal places
Answer: 291.34cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 85, 67, 91, 79, 93, 44. Give your answer to 2 decimal places
Answer: Mean = 79.86, Median = 85, Range = 56