Keystones — Capstone
Five GCSE retrieval questions · 3 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: x² + 9x - 2
Answer: (x + 9⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 77°. Give your answer to 2 decimal places
Answer: 156.87cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 27:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 96, 74, 82, 46, 26, 44, 84, 98. Give your answer to 2 decimal places
Answer: Mean = 69.67, Median = 77, Range = 72