Keystones — Capstone
Five GCSE retrieval questions · 1 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 8
Answer: (x - 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 45°. Give your answer to 2 decimal places
Answer: 78.14cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 68, 47, 39, 70, 51, 57, 93. Give your answer to 2 decimal places
Answer: Mean = 63.13, Median = 62.5, Range = 54