Keystones — Capstone
Five GCSE retrieval questions · 6 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² - 9x + 5
Answer: (x - 9⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 41°. Give your answer to 2 decimal places
Answer: 72.49cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 20, 91, 81, 44, 88, 17. Give your answer to 2 decimal places
Answer: Mean = 61.71, Median = 81, Range = 74