Keystones — Capstone
Five GCSE retrieval questions · 18 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² - 5x + 1
Answer: (x - 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 79°. Give your answer to 2 decimal places
Answer: 194.36cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 59, 75, 25, 18, 63, 33, 77
Answer: Mean = 55.75, Median = 61, Range = 78