Keystones — Capstone
Five GCSE retrieval questions · 3 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 2x² - 20x
Answer: 2(x - 5)² - 50 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 23cm, angle = 49°. Give your answer to 2 decimal places
Answer: 251.7cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 77, 82, 95, 95, 49, 74, 81, 98. Give your answer to 2 decimal places
Answer: Mean = 79.11, Median = 81, Range = 49