Keystones — Capstone
Five GCSE retrieval questions · 20 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√32
Answer: 16√2 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 12
Answer: 2(x - 4)² - 44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 22cm, angle = 72°. Give your answer to 2 decimal places
Answer: 272cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 18:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 30, 12, 43, 96, 15, 38, 39, 100. Give your answer to 2 decimal places
Answer: Mean = 46.89, Median = 39, Range = 88