Keystones — Capstone
Five GCSE retrieval questions · 5 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 4
Answer: (x - 9⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 40°. Give your answer to 2 decimal places
Answer: 80.99cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 90, 56, 26, 56, 27, 28, 63. Give your answer to 2 decimal places
Answer: Mean = 54.38, Median = 56, Range = 64