Keystones — Capstone
Five GCSE retrieval questions · 25 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√125
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: x² - 5x + 10
Answer: (x - 5⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 60°. Give your answer to 2 decimal places
Answer: 285.79cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 27:15:5 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 26, 93, 42, 23, 10, 79. Give your answer to 2 decimal places
Answer: Mean = 43.43, Median = 31, Range = 83