Keystones — Capstone
Five GCSE retrieval questions · 3 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 2
Answer: (x + 5⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 45°. Give your answer to 2 decimal places
Answer: 132.58cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 64, 62, 26, 82, 30, 50, 21, 34. Give your answer to 2 decimal places
Answer: Mean = 43.56, Median = 34, Range = 61