Keystones — Capstone
Five GCSE retrieval questions · 10 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√96
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² + 9x - 11
Answer: (x + 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 64°. Give your answer to 2 decimal places
Answer: 134.37cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 45:72:56 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 73, 96, 52, 96, 34, 50, 19, 92
Answer: Mean = 63, Median = 55, Range = 77