Keystones — Capstone
Five GCSE retrieval questions · 2 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√50
Answer: 15√2 -
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 = 19cm, b = 19cm, angle = 75°. Give your answer to 2 decimal places
Answer: 174.35cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 16:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 79, 36, 38, 53, 55, 89, 57
Answer: Mean = 53, Median = 54, Range = 72