Keystones — Capstone
Five GCSE retrieval questions · 10 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 9
Answer: 2(x - 5)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 28cm, angle = 56°. Give your answer to 2 decimal places
Answer: 162.49cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 33, 10, 11, 50, 20, 50, 74. Give your answer to 2 decimal places
Answer: Mean = 41.63, Median = 41.5, Range = 75