Keystones — Capstone
Five GCSE retrieval questions · 10 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - 7x + 9
Answer: (x - 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 60°. Give your answer to 2 decimal places
Answer: 115.18cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 99, 73, 92, 40, 82, 80, 97. Give your answer to 2 decimal places
Answer: Mean = 72.38, Median = 81, Range = 83