Keystones — Capstone
Five GCSE retrieval questions · 14 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² - 7x - 7
Answer: (x - 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 12cm, angle = 60°. Give your answer to 2 decimal places
Answer: 62.35cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:42:6 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 99, 62, 31, 74, 53, 25, 59, 49. Give your answer to 2 decimal places
Answer: Mean = 56.22, Median = 54, Range = 74