Keystones — Capstone
Five GCSE retrieval questions · 24 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² + 5x - 12
Answer: (x + 5⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 41°. Give your answer to 2 decimal places
Answer: 120.71cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 87, 38, 61, 61, 18, 36, 25
Answer: Mean = 43, Median = 37, Range = 69