Keystones — Capstone
Five GCSE retrieval questions · 18 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 2
Answer: 5(x - 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 80°. Give your answer to 2 decimal places
Answer: 295.44cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 72:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 67, 74, 51, 93, 20, 77. Give your answer to 2 decimal places
Answer: Mean = 61.57, Median = 67, Range = 73