Keystones — Capstone
Five GCSE retrieval questions · 2 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√96
Answer: 16√6 -
2. Algebra Completing the square
Complete the square: x² + 5x - 11
Answer: (x + 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 50°. Give your answer to 2 decimal places
Answer: 153.21cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 21:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 100, 81, 47, 70, 98, 41, 84, 67. Give your answer to 2 decimal places
Answer: Mean = 67.89, Median = 70, Range = 77