Keystones — Capstone
Five GCSE retrieval questions · 14 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 1
Answer: 5(x - 1)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 64°. Give your answer to 2 decimal places
Answer: 323.57cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 46, 85, 82, 90, 61, 45, 45. Give your answer to 2 decimal places
Answer: Mean = 64.38, Median = 61, Range = 45