Keystones — Capstone
Five GCSE retrieval questions · 15 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 67°. Give your answer to 2 decimal places
Answer: 132.55cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 9:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 17, 37, 90, 26, 75, 45, 25, 80. Give your answer to 2 decimal places
Answer: Mean = 51.11, Median = 45, Range = 73