Keystones — Capstone
Five GCSE retrieval questions · 19 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√125
Answer: 25√5 -
2. Algebra Completing the square
Complete the square: 2x² + 20x + 11
Answer: 2(x + 5)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 51°. Give your answer to 2 decimal places
Answer: 139.89cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 44, 44, 68, 10, 65, 92. Give your answer to 2 decimal places
Answer: Mean = 55.71, Median = 65, Range = 82