Keystones — Capstone
Five GCSE retrieval questions · 12 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: x² - 7x + 8
Answer: (x - 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 49°. Give your answer to 2 decimal places
Answer: 109.06cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:10:6 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 38, 32, 77, 11, 70, 85, 21
Answer: Mean = 51.75, Median = 54, Range = 74