Keystones — Capstone
Five GCSE retrieval questions · 23 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: x² - 5x + 6
Answer: (x - 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 53°. Give your answer to 2 decimal places
Answer: 149.74cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:63:36 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 13, 31, 88, 95, 63, 84, 33
Answer: Mean = 63.25, Median = 73.5, Range = 86