Keystones — Capstone
Five GCSE retrieval questions · 4 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: x² - 9x + 3
Answer: (x - 9⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 67°. Give your answer to 2 decimal places
Answer: 115.98cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 16, 15, 75, 45, 37, 94, 83. Give your answer to 2 decimal places
Answer: Mean = 52.38, Median = 49.5, Range = 79