Keystones — Capstone
Five GCSE retrieval questions · 28 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 11x
Answer: (x + 11⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 62°. Give your answer to 2 decimal places
Answer: 346.12cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 18:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 89, 95, 96, 16, 50, 59, 48, 93. Give your answer to 2 decimal places
Answer: Mean = 69.11, Median = 76, Range = 80