Keystones — Capstone
Five GCSE retrieval questions · 18 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + x - 12
Answer: (x + 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 44°. Give your answer to 2 decimal places
Answer: 82.66cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 63:36:20 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 77, 98, 77, 30, 54, 99. Give your answer to 2 decimal places
Answer: Mean = 75.57, Median = 77, Range = 69