Keystones — Capstone
Five GCSE retrieval questions · 6 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 8
Answer: (x + 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 17cm, angle = 79°. Give your answer to 2 decimal places
Answer: 150.19cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 48, 11, 77, 47, 31, 11. Give your answer to 2 decimal places
Answer: Mean = 33.71, Median = 31, Range = 66