Keystones — Capstone
Five GCSE retrieval questions · 15 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + x
Answer: (x + 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 19cm, angle = 55°. Give your answer to 2 decimal places
Answer: 147.86cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 8:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 93, 27, 74, 76, 87, 87. Give your answer to 2 decimal places
Answer: Mean = 67.57, Median = 76, Range = 66