Keystones — Capstone
Five GCSE retrieval questions · 8 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√112
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 10
Answer: (x + 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 55°. Give your answer to 2 decimal places
Answer: 149.09cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:36:16 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 98, 94, 26, 92, 62, 91, 48
Answer: Mean = 72, Median = 78, Range = 72