Keystones — Capstone
Five GCSE retrieval questions · 30 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√75
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 55°. Give your answer to 2 decimal places
Answer: 160.14cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 87, 21, 18, 90, 53, 77, 74, 77. Give your answer to 2 decimal places
Answer: Mean = 58.44, Median = 74, Range = 72