Keystones — Capstone
Five GCSE retrieval questions · 1 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√176
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 2
Answer: (x - 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 42°. Give your answer to 2 decimal places
Answer: 153.9cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 45:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 66, 76, 63, 95, 96, 31, 87, 94. Give your answer to 2 decimal places
Answer: Mean = 70.11, Median = 76, Range = 73