Keystones — Capstone
Five GCSE retrieval questions · 7 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√176
Answer: 16√11 -
2. Algebra Completing the square
Complete the square: x² + 7x - 7
Answer: (x + 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 149.09cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 45:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 66, 49, 31, 81, 70, 16. Give your answer to 2 decimal places
Answer: Mean = 56.57, Median = 66, Range = 67