Keystones — Capstone
Five GCSE retrieval questions · 24 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 5
Answer: 5(x - 5)² - 130 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 21cm, angle = 60°. Give your answer to 2 decimal places
Answer: 254.61cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 50, 24, 98, 18, 62, 79, 68
Answer: Mean = 60.75, Median = 65, Range = 80