Keystones — Capstone
Five GCSE retrieval questions · 10 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² + 9x
Answer: (x + 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 40°. Give your answer to 2 decimal places
Answer: 80.99cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 14:63:9 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 53, 16, 91, 97, 87, 96, 26
Answer: Mean = 67, Median = 78.5, Range = 81