Keystones — Capstone
Five GCSE retrieval questions · 3 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 77°. Give your answer to 2 decimal places
Answer: 131.54cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 65, 62, 51, 13, 24, 60. Give your answer to 2 decimal places
Answer: Mean = 40.86, Median = 51, Range = 54