Keystones — Capstone
Five GCSE retrieval questions · 13 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: x² - 5x + 8
Answer: (x - 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 80°. Give your answer to 2 decimal places
Answer: 128.03cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 14:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 78, 85, 58, 29, 87, 54. Give your answer to 2 decimal places
Answer: Mean = 63.29, Median = 58, Range = 58