Keystones — Capstone
Five GCSE retrieval questions · 30 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 2
Answer: 2(x - 6)² - 74 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 199.92cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:42:12 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 10, 49, 26, 53, 58, 73, 82
Answer: Mean = 54.25, Median = 55.5, Range = 73