Keystones — Capstone
Five GCSE retrieval questions · 3 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 1
Answer: (x + 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 14cm, angle = 53°. Give your answer to 2 decimal places
Answer: 167.71cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:30:12 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 59, 21, 66, 45, 85, 77. Give your answer to 2 decimal places
Answer: Mean = 52.57, Median = 59, Range = 70