Keystones — Capstone
Five GCSE retrieval questions · 7 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² - 9x + 7
Answer: (x - 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 59°. Give your answer to 2 decimal places
Answer: 226.29cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 45:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 16, 60, 22, 52, 84, 85. Give your answer to 2 decimal places
Answer: Mean = 59.57, Median = 60, Range = 82