Keystones — Capstone
Five GCSE retrieval questions · 26 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 5x - 7
Answer: (x + 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 24cm, angle = 50°. Give your answer to 2 decimal places
Answer: 211.43cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 27:12:28 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 80, 37, 88, 42, 40, 29, 19, 76. Give your answer to 2 decimal places
Answer: Mean = 56.78, Median = 42, Range = 81