Keystones — Capstone
Five GCSE retrieval questions · 5 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 11x - 5
Answer: (x - 11⁄2)² - 141⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 26cm, angle = 55°. Give your answer to 2 decimal places
Answer: 244.93cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 49, 75, 57, 96, 98, 14
Answer: Mean = 66, Median = 73, Range = 84