Keystones — Capstone
Five GCSE retrieval questions · 30 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 47°. Give your answer to 2 decimal places
Answer: 164.55cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 14:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 92, 57, 35, 32, 22, 89
Answer: Mean = 59, Median = 57, Range = 70