Keystones — Capstone
Five GCSE retrieval questions · 27 November 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: 5x² - 20x + 14
Answer: 5(x - 2)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 74°. Give your answer to 2 decimal places
Answer: 168.22cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 24:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 52, 71, 69, 86, 50, 60, 38, 58. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 60, Range = 48