Keystones — Capstone
Five GCSE retrieval questions · 5 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 10
Answer: 3(x - 6)² - 118 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 214.72cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 9:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 42, 34, 17, 66, 15, 80, 49, 62. Give your answer to 2 decimal places
Answer: Mean = 49.33, Median = 49, Range = 65