Keystones — Capstone
Five GCSE retrieval questions · 8 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√176
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: x² - 3x - 12
Answer: (x - 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 77°. Give your answer to 2 decimal places
Answer: 128.62cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 63:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 83, 68, 10, 89, 14, 15. Give your answer to 2 decimal places
Answer: Mean = 46.14, Median = 44, Range = 79