Keystones — Capstone
Five GCSE retrieval questions · 19 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² - 3x - 5
Answer: (x - 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 50°. Give your answer to 2 decimal places
Answer: 134.06cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 63:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 65, 91, 96, 21, 55, 100. Give your answer to 2 decimal places
Answer: Mean = 74.14, Median = 91, Range = 79