Keystones — Capstone
Five GCSE retrieval questions · 7 April 2013 · 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 + 3x + 1
Answer: (x + 3⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 28cm, angle = 69°. Give your answer to 2 decimal places
Answer: 339.82cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:15:40 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 93, 16, 77, 75, 59, 79, 43, 34. Give your answer to 2 decimal places
Answer: Mean = 61.22, Median = 75, Range = 77