Keystones — Capstone
Five GCSE retrieval questions · 12 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² + 5x - 12
Answer: (x + 5⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 77°. Give your answer to 2 decimal places
Answer: 315.7cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 10:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 73, 78, 49, 18, 92, 92. Give your answer to 2 decimal places
Answer: Mean = 62.57, Median = 73, Range = 74