Keystones — Capstone
Five GCSE retrieval questions · 22 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√32
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² - 5x + 9
Answer: (x - 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 75°. Give your answer to 2 decimal places
Answer: 104.32cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 8:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 12, 61, 83, 29, 26, 96, 72. Give your answer to 2 decimal places
Answer: Mean = 56.63, Median = 66.5, Range = 84