Keystones — Capstone
Five GCSE retrieval questions · 16 March 2013 · 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 - 5x - 1
Answer: (x - 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 22cm, angle = 77°. Give your answer to 2 decimal places
Answer: 128.62cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 16, 90, 39, 82, 91, 94, 62, 24
Answer: Mean = 57, Median = 62, Range = 79