Keystones — Capstone
Five GCSE retrieval questions · 24 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√27
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 9
Answer: 2(x - 5)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 41°. Give your answer to 2 decimal places
Answer: 149.58cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 47, 31, 56, 31, 70, 63, 51, 73. Give your answer to 2 decimal places
Answer: Mean = 55.67, Median = 56, Range = 48