Keystones — Capstone
Five GCSE retrieval questions · 2 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 3x² - 36x + 11
Answer: 3(x - 6)² - 97 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 73°. Give your answer to 2 decimal places
Answer: 167.35cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 23, 13, 16, 21, 99, 33, 24. Give your answer to 2 decimal places
Answer: Mean = 31.63, Median = 23.5, Range = 86